Allen-Bradley 1791-IOBA/B,IOBB/B User Manual

Block I/O
Cat. No. 1791-IOBA and -IOBB
Series B
User Manual
Important User Information
Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this control
equipment must satisfy themselves that all necessary steps have been taken
to assure that each application and use meets all performance and safety
requirements, including any applicable laws, regulations, codes and
standards.
The illustrations, charts, sample programs and layout examples shown in
this guide are intended solely for example. Since there are many variables
and requirements associated with any particular installation, Allen-Bradley
does not assume responsibility or liability (to include intellectual property
liability) for actual use based upon the examples shown in this publication.
Allen-Bradley publication SGI–1.1, “Safety Guidelines For The
Application, Installation and Maintenance of Solid State Control”
(available from your local Allen-Bradley office) describes some important
differences between solid-state equipment and electromechanical devices
which should be taken into consideration when applying products such as
those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole or
in part, without written permission of Allen–Bradley Company, Inc. is
prohibited.
Throughout this manual we make notes to alert you to possible injury to
people or damage to equipment under specific circumstances.
ATTENTION: Tells readers where people may be hurt if
procedures are not followed properly.
ATTENTION: Tells readers where machinery may be damaged
or economic loss can occur if procedures are not followed
properly.
Warnings and Cautions:
Identify a possible trouble spot.
Tell what causes the trouble.
Give the result of improper action.
Tell the reader how to avoid trouble.
 1992 Allen-Bradley Company, Inc.
PLC is a registered trademark of Allen-Bradley Company, Inc.
SLC is a registered trademark of Allen-Bradley Company, Inc.
Important: We recommend you frequently backup your application
programs on appropriate storage medium to avoid possible data loss.
II
Table of Contents
Important User Information . . . . . . . . . . . . . . . . . . . . . . . .
I
Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P1
Purpose of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About Block I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P1
P1
P1
P1
P2
P2
Introducing Block I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Block I/O Fits in a PLC System . . . . . . . . . . . . . . . . . . . . . . .
11
11
12
Installing Block I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pre-installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Block I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote I/O Link or Distributed I/O Link Wiring . . . . . . . . . . . . . . .
Extended Node Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compatibility of 1771 I/O Products with Extended Node Numbers . .
21
21
23
23
27
29
210
Configuring Your Block I/O for PLC
Family Programmable Controllers . . . . . . . . . . . . . . .
31
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Configuration Switches . . . . . . . . . . . . . . . . . . . . . . . .
31
31
Configuring Your Block I/O for SLC Controllers . . . . . . . . .
41
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Configuration Switches . . . . . . . . . . . . . . . . . . . . . . . .
Addressing the Blocks Using SLC Controllers . . . . . . . . . . . . . . . .
41
41
43
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
51
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A1
Preface
Using This Manual
Purpose of Manual
This manual shows you how to use your block I/O with an Allen–Bradley
programmable controller. It helps you install, program and troubleshoot
your module.
Audience
You must be able to program and operate an Allen–Bradley programmable
controller (PLC) to make efficient use of block I/O modules.
We assume that you know how to do this in this manual. If you do not,
refer to the appropriate PLC programming and operations manual before
you attempt to program this module.
Vocabulary
In this manual, we refer to:
the block I/O module as the “block” or the “module”
the programmable controller as the “controller”
Manual Organization
This manual is divided into 5 chapters. The following chart shows each
chapter with its corresponding title and brief overview of the topics
covered in that chapter.
Chapter
Title
Topics Covered
1
Introducing Block I/O
Description of the modules, including general and
hardware features
2
Installing Block I/O
Module power requirements, location, and wiring
information
3
Configuring Your Block I/O for PLC
Family Programmable Controllers
How to set the configuration switches and address
the block I/O.
4
Configuring Your Block I/O for SLC
Controllers
How to set the switches, and where to go for full
information
5
Troubleshooting
How to use the indicators to troubleshoot your block
I/O module.
Specifications
Specifications for the block I/O.
Appendix A
P1
Preface
Using This Manual
About Block I/O
Block I/O consists of small, self–contained remote I/O devices complete
with power supply, programmable controller interface, input/output
connections and signal conditioning circuitry. Table P.A is a list of
available block I/O modules.
Table P.A
Types of Block I/O
Catalog Number
Description
1791-IOBA
8 sinking inputs, 8 sourcing outputs
1791-IOBB
10 sinking inputs, 6 sourcing outputs
1791-IOVA
8 sourcing inputs, 8 sinking outputs
1791-IOVB
10 sourcing inputs, 6 sinking outputs
1791-IOBW
32 sinking inputs, 32 sourcing outputs
1791-IOVW
32 sourcing inputs, 32 sinking outputs
1791-IOBX
64 sinking inputs, 64 sourcing outputs
1791-IOVX
64 sourcing inputs, 64 sinking outputs
Publication Number
1791-6 5 8
1791-6.5.8
1791-6 5 6
1791-6.5.6
1791-6 5 7
1791-6.5.7
1791-6 5 2
1791-6.5.2
This publication covers the 1791–IOBA/B and –IOBB/B block I/O
modules. The 1791–IOBA/B has 8 inputs and 8 outputs; the
1791–IOBB/B has 10 inputs and 6 outputs. In all other respects, they are
identical.
Related Publications
P2
For a list of publications with information on Allen–Bradley
programmable controller products, consult our publication index (SD499).
Chapter
1
Introducing Block I/O
Chapter Objectives
In this chapter you will learn what block I/O is, its features, and how it
functions.
General Description
1791–IOBA/B and –IOBB/B block I/O modules are small, self–contained
remote I/O devices complete with power supply, programmable controller
interface, input/output connections and signal conditioning circuitry.
The 1791–IOBA/B has 8 inputs and 8 outputs; the 1791–IOBB/B has 10
inputs and 6 outputs. In all other aspects, they are identical.
The blocks are compatible with PLC–2, PLC–3, and PLC–5 family
programmable controllers, and the SLC 500 modular controllers. Refer to
the table below for information on using block I/O with various
Allen-Bradley programmable controllers.
If You are Using:
You must use:
PLC-2 family programmable controller
1771-SN sub-I/O scanner or
1771-SD2 remote I/O scanner
PLC-3 family programmable controller
Block attaches directly to controller
PLC-5 family programmable controller
1747-DSN scanner or
1747-SN remote I/O scanner
SLC 500 programmable controller
Figure 1.1 shows the physical features of the block I/O.
Figure 1.1
Major Features of the Block I/O Module (1791-IOBA/B shown)
DH-485 Port
Switch Assemblies
Status Indicators
OUTPUT
INPUT
Removable Remote I/O Link Connector
Communication LED
COMM
Power LED
POWER
Removable Input/Output Connector
10825-I
11
Chapter 1
Introducing Block I/O
Wiring Connectors – Remote I/O link connector and input/output
connector are removable for easy connection of wiring.
Switch Assemblies – Two DIP switches are provided for setting the I/O
rack number, starting I/O group, transmission rate, last chassis, last state
and DH–485 terminator.
Status Indicators – LED indicators display the status of communication,
power and input/output. These provide a visual indication for aid in
troubleshooting.
DH–485 Port – A plug–in DH–485 data port is provided for use with the
SLC controller.
How Block I/O Fits in a PLC
System
Block I/O is a complete I/O interface that includes the functionality of the
I/O rack, adapter, power supply, and I/O modules in a single unit. Connect
sensors and actuators to the module and use the remote I/O cable to
connect the block I/O to your programmable controller as shown in
chapter 2.
The block uses sinking inputs and sourcing outputs.
In sinking inputs (Figure 1.2), the dc common is bussed on the block. and
the current is sourced from the field device. The sourcing field device
switches the hot side of the power supply bus causing current to flow
through the sourcing device to the sinking input on the block.
Figure 1.2
Sinking Input Example
+V
Block I/O
Field
Device
Field
Device
DC Power
Supply
Sinking
Input
COM
-V
10826-I
12
Chapter 1
Introducing Block I/O
Sourcing outputs (Figure 1.3) have the power bussed in the block. When
the output is on, current is supplied to the field control device, which sinks
the current. The field circuit and the equipment remain at ground potential
until the output is turned on.
Figure 1.3
Sourcing Output Example
Block I/O
+VDC
DC Power
Supply
Fuse
Field
Device
Fuse
Field
Device
-V
10827-I
You connect the block I/O to your remote I/O link as you would any other
device (Figure 1.4). The block looks like a 1/4 I/O rack to the processor,
and uses 2 words of input image table memory and 2 words of output
image table memory. The block is addressed directly on the remote I/O
link.
Block I/O functions exactly like any Allen–Bradley remote I/O product.
Input and output data is scanned asynchronously and transferred back and
forth between the block and the controller input and output image table.
Figure 1.4
Block I/O Connection in a PLC System
Blocks are daisy-chained to
a programmable controller or a
scanner.
Programmable Controller or
Scanner.
Block I/O - each block
is 1/4 I/O rack.
10828-I
13
Chapter
2
Installing Block I/O
Chapter Objectives
In this chapter you will learn how to mount the block, connect the remote
I/O link, connect the input and output wiring to the block, and terminate
the remote I/O link.
Pre-installation
Considerations
Before installation, you must determine:
the number of blocks desired
the total distance of the installation
transmission rate desired
if external fuses are required
Acceptable combinations are shown in Table 2.A.
Table 2.A
Acceptable Combinations of Processor and Block I/O
When using
and
Maximum Capacity
Maximum
Network Distance
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
1771-SN
16 blocks with 150 ohm terminator
1772-SD 1772-SD2
1772-SD,
57.6K
16 blocks/channel, 28 blocks/scanner
with 150 ohm terminator
115.2K
10,000 cable-feet
Any PLC-3 scanner module
57.6K
16 blocks/channel, 64 blocks/scanner
with 150 ohm terminator
115.2K
10,000 cable-feet
PLC-2 family
57.6K
PLC-3 family
1775-S5, or -SR5 module
PLC-55 family
PLC
Baud Rate
Used
5,000 cable-feet
5,000 cable-feet
10,000 cable-feet
/
/
32 blocks/channel,
64 blocks/scanner
115.2K
with 82 ohm terminator
5,000 cable-feet
230.4K
2,000 cable-feet
PLC-5/15
12 blocks with 150 ohm terminator
57.6K
10,000 cable-feet
PLC-5/25
16 blocks with 150 ohm terminator,
28 blocks with 82 ohm terminator
57.6K
10,000 cable-feet
PLC-5/30
16 blocks/channel, 28 blocks per
processor with 150 ohm terminator
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
21
Chapter 2
Installing Block I/O
When using
PLC-5 family (continued)
and
PLC-5/30
Maximum Capacity
/
28 blocks/channel,
28 blocks per
processor with 82 ohm terminator
16 blocks/channel, 32 blocks per
processor with 150 ohm terminator
PLC-5/40L, PLC-5/60L
/
32 blocks/channel,
60 blocks per
processor with 82 ohm terminator
16 blocks/channel, 60 blocks per
processor with 150 ohm terminator
PLC-5/40, PLC-5/60
/
32 blocks/channel,
60 blocks per
processor with 82 ohm terminator
16 blocks/channel, 32
blocks/scanner 64 blocks/(2
blocks/scanner,
scanners) with 150 ohm terminator
PLC-5250
PLC
5250 - requires
i
a 55150-RS
50 S remote
e o e sca
scanner
e
32 blocks/channel
blocks/channel, 32
blocks/scanner, 64 blocks/(2
scanners) with 82 ohm terminator
Baud Rate
Used
Maximum
Network Distance
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
230.4K
2,500 cable-feet
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
230.4K
2,500 cable-feet
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
230.4K
2,500 cable-feet
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
230.4K
2,500 cable-feet
SLC-5/01 Controller
1747-DSN Scanner module*
7 blocks
230.4K
2,500 cable-feet
SLC-5/02 Controller
1747-DSN Scanner module*
30 blocks
230.4K
2,500 cable-feet
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
230.4K
2,500 cable-feet
SLC-5/02 Controller
S Remote I/O
/O
1747-SN
Module
Scanner Module*
16 blocks
* The DH-485 network, which operates independent of the remote I/O/distributed I/O network, supports up to 30 DH-485 nodes (blocks or
1747-AIC isolated couplers). The maximum DH-485 network distance is 4,000 cable-feet.
22
Chapter 2
Installing Block I/O
Installing the Block I/O
Figure 2.1 shows the mounting dimensions for the block I/O module.
Mount the blocks horizontally with a minimum of 2” between blocks. This
air gap is necessary to maintain proper cooling air flow through the block.
Figure 2.1
Mounting Dimensions for the Block I/O Module (Cat. No. 1791-IOBA/B
and -IOBB/B)
10mm
0.39"
Depth = 96.0mm (3.78")
8mm
0.31"
198mm
7.8"
OUTPUT
COMM POWER
INPUT
35mm
1.37"
10mm
0.39"
180mm
7.1"
16mm
0.63"
16mm
0.63"
212mm
8.35"
10829-I
The operating temperature in the air gap between block I/O modules must
not exceed 55oC (151oF). Figure 2.2 shows the dimensions of the required
air gap.
Figure 2.2
Clearance Required for Block I/O Modules
51mm
2"
OUTPUT
COMM POWER
INPUT
51mm
2"
51mm
2"
51mm
2"
10830-I
Connecting Wiring
Connections to the block I/O module are made to the removable
connectors which plug into the front of the block. The connector blocks are
keyed to prevent incorrect insertion and are secured by screws.
Wiring for the block is shown in Figure 2.3 and Figure 2.4. Remote I/O
wiring connections are shown in Figure 2.5.
23
Chapter 2
Installing Block I/O
Figure 2.3
Input and Output Connections for the 1791-IOBA/B
8 OUTPUTS
2 SHD 1 B A COM +24 DCN CG
8 INPUTS
VDC O0 O1 O2 O3 O4 O5
O6 O7
I0
I1
I2
I3
I4
I5
I6
I7 COM
Remote
DH-485
I/O Link
(for SLC
(see Figure 2.5) only)
+24V dc
dc Neutral
Chassis Ground
Input Common
Output +Vdc
INPUT 7
INPUT 6
INPUT 5
INPUT 4
INPUT 3
INPUT 2
INPUT 1
INPUT 0
OUTPUT 0
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
OUTPUT 6
OUTPUT 7
10831-I
Figure 2.4
Input/Output Wiring Connections for the 1791-IOBB/B
10 INPUTS
6 OUTPUTS
2 SHD 1 B
A COM +24 DCN CG
Remote
I/O Link
DH-485
(for SLC only)
+24V dc
dc Neutral
Chassis Ground
24
VDC O0
O1
O2 O3 O4 O5
I0
I1
I2
I3
I4
I5
I6
I7
I8
I9
COM
Input Common
Output +Vdc
OUTPUT 0
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
INPUT 9
INPUT 8
INPUT 7
INPUT 6
INPUT 5
INPUT 4
INPUT 3
INPUT 2
INPUT 1
INPUT 0
Chapter 2
Installing Block I/O
Table 2.B
Wiring Block Designations
1791-IOBA
Connector
Remote I/O Connector
I/O Connector
Designation
1791-IOBB
Description
Designation
Description
1
Blue wire - RIO
1
Blue wire - RIO
2
Clear wire - RIO
2
Clear wire - RIO
SHD
Shield - RIO
SHD
Shield - RIO
A
DH-485 A
A
DH-485 A
B
DH-485 B
B
DH-485 B
COM
DH-485 Common
COM
DH-485 Common
+24
+24V dc
+24
+24V dc
DCN
dc neutral
DCN
dc neutral
CG
Chassis ground
CG
Chassis ground
VDC
Output supply
VDC
Output supply
O0 thru O7
Output 0 thru 7
O0 thru O5
Output 0 thru 5
I0 thru I7
Input 0 thru 7
I0 thru I9
Input 0 thru 9
COM
Input common
COM
Input common
Power Supply Requirements
An external 24V dc power supply is required to power the block. Total
current required to power the block is equal to 200mA plus an inrush of
5.5A for 10µsec for each block. The supply must be able to source an
additional 100mA plus an inrush current of 400mA when a peripheral is
connected.
In addition, the external power supply should have current limiting
capabilities. The voltage range must not exceed 20.5–27.6V dc.
25
Chapter 2
Installing Block I/O
Wiring Requirements
Table 2.C shows the wiring cable requirements for the 1791–IOBA/B and
1791–IOBB/B modules.
Table 2.C
Acceptable Wiring Cables for Block I/O Connection
Use
Cable Type
With
Remote I/O Link or DIO Link
Belden 9463
PLC-2, PLC-3, PLC-5 family programmable
controllers and SLC controllers
DH-485 Data Link
Belden 9842
SLC controllers only
Input and Output wiring
Up to 14AWG
Stranded with 3/64
inch insulation
All
Figure 2.5
Remote I/O Link Wiring
Tighten screw to clamp wire.
Connection
1
Clear wire
Blue wire
Shield wire
X
2
SHD
X
Clear
X
Shield
26
Blue
10832-I
Chapter 2
Installing Block I/O
Remote I/O Link or
Distributed I/O Link Wiring
Blocks must be wired in series as shown in Figure 2.6 or Figure 2.7. Do
not attempt to wire any block in parallel.
The number of blocks used depends not only on the user requirements but
also on the system used. Refer to Table 2.A (page 2-1) for maximum
block usage for individual systems.
Figure 2.6
Series Connection for Block I/O Using PLC-2, PLC-3 or PLC-5 Family
Programmable Controllers
To Programmable Controller
or I/O Scanner Module
1 I/O Rack
1 I/O Rack
1 I/O Rack
1 I/O Rack
Install terminating resistor on last block.
10833-I
27
Chapter 2
Installing Block I/O
Figure 2.7
Series Configurations for Block I/O Using the SLC Programmable
Controller
To
1747-DSN
Scanner Module
Up to 7 blocks
using SLC-5/01
Processor
To
1747-DSN
Scanner Module
1
Install terminating resistor
on last block.
2
29
30
To
1747-SN
Scanner Module
Up to 30 blocks with
SLC-5/02
Install terminating resistor
on last block.
1
2
15
16
Install terminating resistor
on last block.
Up to 16 blocks with
SLC-5/02
10834-I
28
Chapter 2
Installing Block I/O
Termination Resistor
A termination resistor must be installed on the last block in a series.
Connect the resistor as shown in Figure 2.8. Use the resistor as identified
in Table 2.D.
Figure 2.8
Installing the Termination Resistor
Tighten screw to clamp
wires and termination resistor.
Connect termination
resistor across terminals
1 and 2
Termination Resistor
10835-I
Table 2.D
Terminator Requirements
System
PLC-2, PLC-3, PLC-5 family,
SLC 500 family
Extended Node Capability
Terminator Resistor
150 ohm - 57.6K and 115.2K baud
82 ohm - 230.4K baud
If this is the last remote I/O adapter on the remote I/O link in a PLC
system, you must use a terminating resistor to terminate both ends of the
remote I/O link (scanner end and last block end). The size of the terminator
is determined by the system configuration.
Older configurations can use a 150 ohm resistor at both ends. With newer
devices that can support it, you can use an 82 ohm termination resistor at
both ends. The 82 ohm terminators provide “extended node” capability
which allows you to have up to 32 physical devices on the remote I/O link.
(The number of logical racks capable of being addressed by the scanner is
not affected.)
ATTENTION: Devices that are operating at 230.4K baud must
have 82 ohm terminators in place for proper operation.
29
Chapter 2
Installing Block I/O
Compatibility of 1771 I/O
Products with Extended
Node Numbers
Certain products are not compatible with extended node capabilities
obtained with the use of 82 ohm terminators. Table 2.E lists those products
that are not compatible.
Table 2.E
Non-compatible Products
Device
Scanners -
Adapters -
Miscellaneous -
210
Series
1771-SN
All
1772-SD
All
1772-SD2
All
1775-SR
All
1775-S4A
All
1775-S4B
All
1771-AS
All
1771-ASB
Series A
1771-DCM
All
1771-AF
All
1771-AF1
All
Chapter
3
Configuring Your Block I/O for PLC
Family Programmable Controllers
Chapter Objectives
In this chapter you will learn how to configure your block I/O when used
with PLC family programmable controllers. This includes the following:
setting the configuration switches
addressing the block I/O
Setting the Configuration
Switches
Each block I/O module has two 6–position DIP switches for setting:
starting I/O group
I/O rack number
transmission (baud) rate
last chassis
last state
DH–485 terminator
These switches are accessible by opening the door on the left side of the
module (Figure 3.1).
31
Chapter 3
Configuring Your Block I/O for PLC
Family Programmable Controllers
Figure 3.1
Switch Settings for 1791-IOBA/B and -IOBB/B
S1
S2
OUTPUT
COMM POWER
INPUT
Baud Rate
0
2
4
6
Switch
1
2
On (Closed) On (Closed)
Off (Open) On (Closed)
On (Closed) Off (Open)
Off (Open) Off (Open)
OPEN
3 4 5 6
OPEN
Last State
4
Reset to 0
Off (Open)
Hold last state On (Closed)
Not
Used
Last Chassis
Switch as viewed from this end.
3
Yes
Off (Open)
No
On (Closed)
DH-485
Terminate
None
Off = Open
On = Closed
1
Off (Open)
On (Closed)
Table 3.A
Addressing PLC-2 Family Processors
32
6
On (Closed) Off (Open)
Off (Open) On (Closed)
On (Closed) On (Closed)
230.4K
115.2K
57.6K
S2
1 2
Starting
I/O Group
1 2
I/O Rack Number
Switches 3-6
(see Table 3.A, B and C)
3 4 5 6
S1
5
Switch Number
I/O Rack
Number
3
4
5
6
1
On (Closed)
On (Closed)
On (Closed)
On (Closed)
2
Off (Open)
On (Closed)
On (Closed)
On (Closed)
3
On (Closed)
Off (Open)
On (Closed)
On (Closed)
4
Off (Open)
Off (Open)
On (Closed)
On (Closed)
5
On (Closed)
On (Closed)
Off (Open)
On (Closed)
6
Off (Open)
On (Closed)
Off (Open)
On (Closed)
7
On (Closed)
Off (Open)
Off (Open)
On (Closed)
10836-I
Chapter 3
Configuring Your Block I/O for PLC
Family Programmable Controllers
Table 3.B
Addressing PLC-3 and PLC-5/250 Processors
I/O Rack
Number
3
Switch Number
4
5
6
I/O Rack
Number
3
0
On (Closed)
On (Closed)
1
Off (Open)
2
Switch Number
4
5
On (Closed)
On (Closed)
10
On (Closed)
On (Closed)
On (Closed)
Off (Open)
On (Closed)
On (Closed)
On (Closed)
11
Off (Open)
On (Closed)
On (Closed)
Off (Open)
On (Closed)
Off (Open)
On (Closed)
On (Closed)
12
On (Closed)
Off (Open)
On (Closed)
Off (Open)
3
Off (Open)
Off (Open)
On (Closed)
On (Closed)
13
Off (Open)
Off (Open)
On (Closed)
Off (Open)
4
On (Closed)
On (Closed)
Off (Open)
On (Closed)
14
On (Closed)
On (Closed)
Off (Open)
Off (Open)
5
Off (Open)
On (Closed)
Off (Open)
On (Closed)
15
Off (Open)
On (Closed)
Off (Open)
Off (Open)
6
On (Closed)
Off (Open)
Off (Open)
On (Closed)
16
On (Closed)
Off (Open)
Off (Open)
Off (Open)
7
Off (Open)
Off (Open)
Off (Open)
On (Closed)
17
Off (Open)
Off (Open)
Off (Open)
Off (Open)
6
Table 3.C
Addressing PLC-5 I/O Processors
I/O Rack
Number
3
Switch Number
4
5
6
I/O Rack
Number
3
01
Off (Open)
On (Closed)
02
On (Closed)
03
Off (Open)
On (Closed)
On (Closed)
10
On (Closed)
On (Closed)
On (Closed)
Off (Open)
Off (Open)
On (Closed)
On (Closed)
11
Off (Open)
On (Closed)
On (Closed)
Off (Open)
Off (Open)
On (Closed)
On (Closed)
12
On (Closed)
Off (Open)
On (Closed)
Off (Open)
13
Off (Open)
Off (Open)
On (Closed)
Off (Open)
PLC-5/15 processors can scan racks 01-03
Switch Number
4
5
6
04
On (Closed)
On (Closed)
Off (Open)
On (Closed)
14
On (Closed)
On (Closed)
Off (Open)
Off (Open)
05
Off (Open)
On (Closed)
Off (Open)
On (Closed)
15
Off (Open)
On (Closed)
Off (Open)
Off (Open)
06
On (Closed)
Off (Open)
Off (Open)
On (Closed)
16
On (Closed)
Off (Open)
Off (Open)
Off (Open)
07
Off (Open)
Off (Open)
Off (Open)
On (Closed)
17
Off (Open)
Off (Open)
Off (Open)
Off (Open)
PLC-5/25 processors can scan racks 01-07
PLC-5/40 and 5/60 processors can scan racks 01-17
Each block uses 2 words of output image table memory and 2 words of
input image table memory. Each block occupies 1/4 rack of data table, with
4 blocks comprising 1 logical rack. Image table usage for one assigned
rack number is shown in Figure 3.2 (IOBA) and Figure 3.4 (IOBB). An
example of image table usage is shown in Figure 3.3 (IOBA) and
Figure 3.5 (IOBB).
33
Chapter 3
Configuring Your Block I/O for PLC
Family Programmable Controllers
Figure 3.2
I/O Image Table for One Assigned Rack Number with 1791-IOBA/B
Input Image
10 7
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
17
0
1
2
3
4
5
6
7
1791-IOBA/B
1791-IOBA/B
1791-IOBA/B
Rack 1
1791-IOBA/B
Output Image
10 7
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
17
0
1
2
3
4
5
6
7
0
0
For 1791-IOBA/B - 7-0 input and 7-0 output image bits
10837-I
Figure 3.3
Input Table Usage Example for One Starting I/O Group with 1791-IOBA/B
PLC-2 Example
1
1 0 00
PLC-3, PLC-5, PLC-5/250 Example
Type of I/O
I/O Group Number
110
I/O Bit
I/O Group Number
I/O Rack Number
Reserved
Reserved
11
10 7
6
5
4
3
2
1
0
2
1
0
Input Image
Block Data
010
011
34
I = Input
O = Output
I/O Bit
I/O Rack Number
111
1 0 00
Type of I/O
1 = Input
0 = Output
Starting
I/O Group
0
I
Reserved
Reserved
11
10 7
6
5
4
3
Block Data
Output Image
10838-I
Chapter 3
Configuring Your Block I/O for PLC
Family Programmable Controllers
Figure 3.4
I/O Image Table for One Assigned Rack Number with 1791-IOBB/B
Input Image
10 7
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
17
0
1
2
3
4
5
6
7
1791-IOBB/B
1791-IOBB/B
1791-IOBB/B
1 I/O Rack
1791-IOBB/B
Output Image
10 7
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
17
0
1
2
3
4
5
6
7
0
0
For 1791-IOBB/B - 11-0 input and 5-0 output image bits
Figure 3.5
Input Table Usage Example for One Starting I/O Group with 1791-IOBB/B
PLC-2 Example
1
1 2 00
PLC-3, PLC-5, PLC-5/250 Example
Type of I/O
I/O Group Number
112
I/O Bit
I/O Group Number
I/O Rack Number
Reserved
Reserved
11
10 7
6
5
4
3
2
1
0
2
1
0
Input Image
Block Data
012
013
I = Input
O = Output
I/O Bit
I/O Rack Number
113
1 2 00
Type of I/O
1 = Input
0 = Output
Starting
I/O Group
2
I
Reserved
Reserved
11
10 7
6
5
4
3
Output Image
Block Data
35
Chapter
4
Configuring Your Block I/O for SLC
Controllers
Chapter Objectives
In this chapter you will learn how to configure your block I/O when used
with SLC family controllers. This includes the following:
setting the configuration switches
addressing the block I/O
Refer to publication 1747–NM004 Series A, “Distributed I/O Scanner,“
and publication 1747–NM005 Series A, “RIO Scanner” for complete
information on switch settings and addressing of the block I/O.
Setting the Configuration
Switches
Each block I/O module has two 6–position DIP switches for setting:
block address
transmission (baud) rate
last state or reset
DH–485 termination
These switches are accessible by opening the door on the left side of the
module (Figure 4.1).
41
Chapter 4
Configuring Your Block I/O for
SLC Controllers
Figure 4.1
Switch Settings for Block I/O when used with the SLC 500 Controller
S1
S2
OUTPUT
COMM POWER
INPUT
1-7
1-15
17-31
Switches
1-6
100000 to 111000
100000 to 111100
100010 to 111110
OPEN
3 4 5 6
OPEN
S2
1 2
Block
Addresses
1 2
3 4 5 6
S1
Switch as viewed from this end.
Baud Rate
5
6
230.4K
On (0)
Off (1)
Hold Last State
Not Used
Reset to 0
4
Off (1)
Hold last state On (0)
DH-485
Terminate
None
1
On (0)
Off (1)
Off = Open = 1
On = Closed = 0
42
10839-I
Chapter 4
Configuring Your Block I/O for
SLC Controllers
Table 4.A
Addressing SLC 500 Controllers
Block
Address
1
2
6
Block
Address
1
2
1
Off (1)
On (0)
On (0) On (0) On (0)
On (0)
17
Off (1)
On (0)
On (0)
On (0)
Off (1)
On (0)
2
On (0)
Off (1)
On (0) On (0) On (0)
On (0)
18
On (0)
Off (1)
On (0)
On (0)
Off (1)
On (0)
3
Off (1)
Off (1)
On (0) On (0) On (0)
On (0)
19
Off (1)
Off (1)
On (0)
On (0)
Off (1)
On (0)
4
On (0)
On (0)
Off (1) On (0) On (0)
On (0)
20
On (0)
On (0)
Off (1)
On (0)
Off (1)
On (0)
5
Off (1)
On (0)
Off (1) On (0) On (0)
On (0)
21
Off (1)
On (0)
Off (1)
On (0)
Off (1)
On (0)
6
On (0)
Off (1)
Off (1) On (0) On (0)
On (0)
22
On (0)
Off (1)
Off (1)
On (0)
Off (1)
On (0)
7
Off (1)
Off (1)
Off (1) On (0) On (0)
On (0)
23
Off (1)
Off (1)
Off (1)
On (0)
Off (1)
On (0)
8
On (0)
On (0)
On (0)
Off (1) On (0)
On (0)
24
On (0)
On (0)
On (0)
Off (1)
Off (1)
On (0)
9
Off (1)
On (0)
On (0)
Off (1) On (0)
On (0)
25
Off (1)
On (0)
On (0)
Off (1)
Off (1)
On (0)
10
On (0)
Off (1)
On (0)
Off (1) On (0)
On (0)
26
On (0)
Off (1)
On (0)
Off (1)
Off (1)
On (0)
11
Off (1)
Off (1)
On (0)
Off (1) On (0)
On (0)
27
Off (1)
Off (1)
On (0)
Off (1)
Off (1)
On (0)
12
On (0)
On (0)
Off (1)
Off (1) On (0)
On (0)
28
On (0)
On (0)
Off (1)
Off (1)
Off (1)
On (0)
13
Off (1)
On (0)
Off (1)
Off (1) On (0)
On (0)
29
Off (1)
On (0)
Off (1)
Off (1)
Off (1)
On (0)
14
On (0)
Off (1)
Off (1)
Off (1) On (0)
On (0)
30
On (0)
Off (1)
Off (1)
Off (1)
Off (1)
On (0)
15
Off (1)
Off (1)
Off (1)
Off (1) On (0)
On (0)
31
Off (1)
Off (1)
Off (1)
Off (1)
Off (1)
On (0)
16
Addressing the Blocks
Using SLC Controllers
Switch S1 Positions
3
4
5
Switch S1 Positions
3
4
5
6
Invalid
The SLC controller communicates with the block I/O using a Distributed
I/O Scanner module (cat. no. 1747–DSN) or an RIO Scanner module (cat.
no. 1747–SN). The 1747–DSN scanner can address up to 7 blocks using an
SLC 5/01 Controller, and up to 30 blocks using an SLC 5/02 Controller.
The 1747–SN scanner, only used with the SLC 5/02 processor, can address
16 blocks. When used with the Distributed I/O Scanner module, block
addresses must be contiguous. The actual number of blocks to which the
1747–DSN scanner module will communicate is determined when
programming the SLC controller.
Refer to publication 1747–NM004 Series A, “Distributed I/O Scanner,“
and publication 1747–NM005 Series A, “RIO Scanner” for complete
information on switch settings and addressing of the block I/O.
43
Chapter
5
Troubleshooting
Chapter Objectives
In this chapter you will learn about the LED indicators on the block I/O
module, and how to use them to troubleshoot the unit.
LED Indicators
Each block I/O module has LED indicators (Figure 5.1) which provide
indication of module status. Each module has the following:
green communication indicator – indicates whether communication is
occurring between processor or scanner and the block.
red power indicator – indicates if power is applied to module and
internal hardware status
16 I/O status indicators (8 input–8 output or 10 input–6 output) – reflect
the state of the individual inputs and outputs (on or off)
Figure 5.1 shows the location of the indicators. Refer to Table 5.A for
status indications reported by the indicators.
Figure 5.1
Indicators on the Block I/O Module (1791-IOBA/B shown)
Status Indicators
OUTPUT
INPUT
Communication LED (green) Power LED (red)
COMM POWER
10846-I
51
Chapter 5
Troubleshooting
Table 5.A
Troubleshooting Chart
Indication
Probable Cause
Corrective Action
Green COMM LED on
Red POWER LED on
I/O status LED on/off
Normal indication
None required
Red POWER LED flashing
Block failed self-test, or a major fault is detected.
Cycle power to the block. If problem persists,
replace the block.
Red POWER LED off
No 24V dc power connected, or hardware fault.
Check 24V dc power to block
Green COMM LED off
No communication with processor, scanner etc.
Check that power LED is on. Make sure that
proper number of blocks are configured.
Check remote I/O link or distributed I/O link wiring.
Reset command (or output disable bit for SLC) has
been issued by processor or scanner.
Check program. Correct as necessary.
SLC or programmable controller not in run mode.
Place in run mode.
Green COMM LED flashing
52
Appendix
A
Specifications
General Specifications
External power
Environmental Conditions
Operating Temperature
Storage Temperature
Relative Humidity
Conductors
Wire Size
200mA @ 24V dc; initial surge 5.5A for 10µsec.
The supply must be able to source an additional 100mA
plus an inrush current of 400mA when a peripheral is
connected.
32 to 131oF (0 to 55oC)
-40 to 185oF (-40 to 85oC)
5 to 95% noncondensing
14 gauge stranded (maximum)
3/64 inch insulation (maximum)
Power Dissipation
IOBA/B: 13.94 Watts (maximum); 9.62 Watts (typical)
IOBB/B: 13.05 Watts (maximum); 8.92 Watts (typical)
Thermal Dissipation
IOBA/B: 47.7 BTU/hr (maximum); 32.9 BTU/hr (typical)
IOBB/B: 44.6 BTU/hr (maximum); 30.5 BTU/hr (typical)
Remote I/O Isolation
850V dc (transformer) for 1 second
DH-485 Isolation
850V dc (optocoupler) for 1 second
Interconnect cable length
RIO: PLC
SLC
DH-485
Cable requirements
57.6K
10,000 cable-feet
115.2K
5,000 cable-feet
230.4K
2,500 cable-feet
230.4K
2,500 cable-feet
4000 ft (1219 meters)
RIO/DIO - Belden 9463
DH-485 - Belden 9842
1791-IOBA/B Input Specifications
Number of Inputs
8
Input type
Sinking
Input voltage range
20.5 to 27.6V dc
On-state input current
6.5mA (minimum) @ 20.5V dc
On-state input voltage
20.5V dc (minimum)
Off-state voltage
6.0V dc (maximum)
Off-state current
1.5mA dc (maximum)
Turn On time
1.5msec (maximum)
Turn Off time
1.0msec (maximum)
A1
Appendix A
Specifications
1791-IOBA/B Output Specifications
Number of outputs
8
Output type
Source
Rated output voltage
10 to 30V dc
Maximum on-state voltage drop
1.5V dc @ 25oC
Maximum on-state current
0.5A
Minimum on-state current
15mA
Surge Current
3.0A for 10ms (maximum), 1 pulse per second max.
Off-state voltage
30V dc (maximum)
Off-state leakage current
0.5mA (maximum)
Turn on time
0.5ms (maximum)
Turn off time
1ms (maximum)
1791-IOBB/B Input Specifications
A2
Number of Inputs
10
Input type
Sinking
Input voltage
20.5 to 27.6V dc
On-state input voltage
20.5V dc (minimum)
On-state input current
6.5mA (minimum) @ 20.5V dc
Off-state voltage
6.00V dc (maximum)
Off-state current
1.5mA dc (maximum)
Turn On time
1.5msec (maximum)
Turn Off time
1.0msec (maximum)
Appendix A
Specifications
1791-IOBB/B Output Specifications
Number of outputs
6
Output type
Source
Rated output voltage
10 to 30V dc
Maximum on-state voltage drop
1.5V dc @ 25oC
Maximum on-state current
0.5A
Minimum on-state current
15mA
Surge Current (maximum)
3.0A for 10ms (max), 1 pulse per second max.
Off-state voltage
30V dc (maximum)
Off-state leakage current
0.5mA (maximum)
Turn on time
0.5ms (maximum)
Turn off time
1ms (maximum)
A3
Index
B
block addressing, SLC, 43
C
compatibility, extended node numbers,
210
configuration switches, 31
SLC, 41
M
mounting dimensions, 23
P
power supply requirements, 25
R
connecting block I/O, in a PLC system, 13
related publications, P2
connecting wiring, 23
1791-IOBA, 24
1791-IOBB, 24
remote I/O link connector, 12
D
description, P2, 11
DH-485 port, 12
E
extended node capability, 29
remote I/O link wiring, 27
S
series connections
PLC-2, PLC-3 and PLC-5, 27
SLC, 28
sinking inputs, 12
description, 12
sourcing outputs, 12
description, 13
specifications, A1
F
features, 11
I
I/O rack addressing
PLC-2 family, 32
PLC-3 and PLC-5/250, 33
PLC-5, 33
image table usage, 33
1791-IOBA, 34
1791-IOBB, 35
status indicators, 12
switch assemblies, 12
T
termination resistor, 29
troubleshooting chart, 52
Types of block I/O, P2
types of block I/O, 11
W
wiring cable, 26
L
LED indicators, 51
wiring connections, definitions, 25
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Publication 1791–6.5.8 – April 1992
P/N 955112–02
Supersedes publication 1791–6.5.8 – March 1992
Copyright 1992 Allen-Bradley Company, Inc. Printed in USA
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