To The Installer
Pre-installation
Considerations
Power Requirements
Initial Handling
AC/DC (120V) Input Module
Cat. No. 1771-IAD Series C
Installation Instructions
This document provides information on: important pre-installation considerations power supply requirements initial handling procedures installing the module using the indicators for troubleshooting module specifications
The 1771-IAD Series C module is compatible with all chassis except the
1771-A1, 1771-A2 and 1771-A4 chassis. Make sure no other input module or single card block transfer module is placed in the same module group when using 2-slot addressing. Any discrete output module may be used within the same module group.
Your module receives its power through the 1771 I/O chassis backplane from the chassis power supply. The module requires 195mA from the output of this supply. Add this to the requirements of all other modules in the I/O chassis to prevent overloading the chassis backplane and/or chassis power supply.
The ac/dc input module is shipped in a static-shielded bag to guard against electrostatic discharge damage. Observe the following precautions when handling the module.
ATTENTION: This module is equipped with a plastic cover that is unique to all assembly numbers with the prefix 961440.
(This part number is located near the backplane edge connector pins on the component-side of the circuit board.) Do not use this plastic cover on any other module.
Installation Instructions
AC/DC (120V) Input Module
Cat. No. 1771-IAD Series C
2
Installing Your Module
Electrostatic Discharge Damage
ATTENTION: Under some conditions, electrostatic discharge can degrade performance or damage the module. Observe the following precautions to guard against electrostatic damage.
Wear an approved wrist strap grounding device, or touch a grounded object to discharge yourself before handling the module.
Do not touch the backplane connector or connector pins.
If you configure or replace internal components, do not touch other circuit components inside the module. If available, use a static-free work station.
When not in use, keep the module in its static-shielded bag.
In this section, we tell you how to: change the delay time jumper key your I/O chassis install your module make your wiring connections
Changing the Delay Time Jumper
Your module is equipped with an adjustable delay time jumper. Use the jumper to select between two input channel delay times. The delay time you choose applies to all sixteen of the module’s channels.
Use this delay time: If you want:
5ms
20ms to detect typical input readings to prevent detection of false inputs in high-noise environments
The module is shipped with the delay time jumper preset to 5ms. To change the delay time jumper to 20ms, do the following:
1.
Locate the delay time jumper selection plug at the top-right edge of the module circuit board, as shown in the following figure.
2.
Use your finger to slide the jumper off the 5ms position (the middle post and the right post).
3.
Carefully reposition the jumper by sliding it onto the 20ms position
(the middle post and the left post).
Top-right edge of circuit board
20ms 5ms
Delay Time Jumper
(shown in preset 5ms position)
12636-I
Installation Instructions
AC/DC (120V) Input Module
Cat. No. 1771-IAD Series C
Keying Your I/O Chassis
Use the plastic keying bands, shipped with each I/O chassis, to key the I/O slots to accept only this type of module.
The module circuit board is slotted in two places on the rear edge. The position of the keying bands on the backplane connector must correspond to these slots to allow insertion of the module. You can key any connector in an I/O chassis to receive this module except for the left-most connector reserved for adapter or processor modules. Place keying bands between the following numbers labeled on the backplane connector:
Between 10 and 12
Between 14 and 16
You can change the position of these keys if system redesign and rewiring makes insertion of a different module necessary.
Installing Your Input Module
To install the ac/dc input module in your 1771 I/O chassis, follow the steps listed below.
ATTENTION: Remove power from the 1771 I/O chassis backplane and field wiring arm before removing or installing an
I/O module.
Failure to remove power from the backplane or field wiring arm could cause module damage, degradation of performance, or injury.
Failure to remove power from the backplane could cause injury or equipment damage due to possible unexpected operation.
1.
Turn off power to the I/O chassis.
2.
Place the module in the plastic tracks on the top and bottom of the slot that guides the module into position.
3.
Do not force the module into its backplane connector. Apply firm, even pressure on the module to seat it properly.
4.
Snap the chassis latch over the top of the module to secure its position.
5.
Connect the field wiring arm to the module.
6.
Make wiring connections to the field wiring arm as indicated in
Figure 1.
3
4
Installation Instructions
AC/DC (120V) Input Module
Cat. No. 1771-IAD Series C
Connecting Wiring to the Input Module
Connections to the input module are made to the field wiring arm (cat. no.
1771-WH) shipped with the module. Attach the field wiring arm to the pivot bar on the bottom of the I/O chassis. The field wiring arm pivots upward and connects with the module so you can install or remove the module without disconnecting the wires.
Figure 1
Connection Diagram
L1 ac/dc High
Terminal A
Terminal B
Terminal C
Terminal D
Input 00
Input 01
Input 02
Input 03
Input 04
Input 05
Input 06
Input 07
Input 10
Input 11
Input 12
Input 13
Input 14
Input 15
Input 16
Input 17
Terminal E
05
06
07
10
11
12
D
00
01
02
03
04
A
B
C
16
17
E
13
14
15
L2 ac/dc Low
Field Wiring Arm
Cat. No. 1771-WH
(Actual wiring runs in this direction.) 10589-I
Connect one terminal of your 2-wire input device to terminals 00 thru 17
(Figure 1). Connect L1 (high) ac/dc line to the other terminal of your input devices. Connect terminal E to the L2 (low) ac/dc return. Terminals A thru
D are not used. Use stranded 14 or 16 gauge wire to minimize the voltage drop over long cable distances.
Installation Instructions
AC/DC (120V) Input Module
Cat. No. 1771-IAD Series C
Important: You can use an AC (120V) Output Module (cat. no.
1771-OAD) to directly drive terminals on an AC/DC (120V) Input Module
(cat. no. 1771-IAD) (Figure 2).
Figure 2
Driving a 1771-IAD Module with a 1771-OAD Module
AC (12-120V)
Output Module
(Cat. No. 1771-OAD)
AC/DC (120V)
Input Module
(Cat. No. 1771-IAD)
L1
120V ac High
Note: 1771-OAD output voltage
range is 12-138V ac. However, the on-state voltage range of the
1771-IAD is 79-138V ac.
ac Low
L2
10590-I
You can also use a 1771-OA Output module to drive an AC/DC (120V)
Input Module (cat. no. 1771-IAD) but you must connect one of the following between the output terminal and L2 (common) (Figure 3).
2500 ohm, 10W resistor
RG-1676-1 Electrocube (San Gabriel, California)
Use the same ac power source to power both modules to ensure proper phasing and prevent module damage.
5
Installation Instructions
AC/DC (120V) Input Module
Cat. No. 1771-IAD Series C
Figure 3
Driving a 1771-IAD Module with a 1771-OA Module
AC (120V)
Output Module
(Cat. No. 1771-OA)
AC/DC (120V)
Input Module
(Cat. No. 1771-IAD)
L1 ac High
6
Interpreting the Status
Indicators
Note: 1771-OA output voltage range is 92-138V ac. However, the on-state voltage range of the
1771-IAD is 79-138V ac.
2500 ohm 10W resistor
L2 ac Low
10591-I
The front panel of your module contains one green module active indicator, and 16 red status indicators (figure 4).
When the green module active indicator lights, the rack power supply has properly established 5Vdc. To properly interpret the red status indicators, the module active indicator must be lit.
The red status indicators are provided for system logic side indication of individual inputs. When a red indicator lights, voltage is present on the terminal. The module transfers this information to the backplane for the processor to read. See ‘‘Troubleshooting” for a description, probable cause, and recommended action to take for common faults based on indicator responses.
Installation Instructions
AC/DC (120V) Input Module
Cat. No. 1771-IAD Series C
Figure 4
Status Indicators
ACTIVE
00
01
10
11
02
03
12
13
04
05
14
15
06
07
16
17
Module Active Indicator (green)
00 to 17 Status Indicators (red)
10592-I
Troubleshooting
Indicator Status (color)
Module active ON (green)
Module active ON (green) and
Input status ON (red)
Module active ON (green) and
Input status OFF
Module active OFF and
Input status ON (red) or OFF
Use this table to help you interpret the 1771-IAD status indicators and to troubleshoot module and system faults.
Description of Fault or System Status
Normal Indication
Check for voltage on terminal.
Input devices not functioning properly or faulty input circuitry on module.
No voltage on terminal.
Not valid unless module active indicator is on; when active is off, indicators do not represent processor status.
Action to Take
None
If voltage is present, take no action. If no voltage is present, replace the module.
1. Check input devices.
2. If input devices are OK, replace module.
None
1. Check chassis power supply and module
input power.
2. If power supplies are OK, replace module.
7
Installation Instructions
AC/DC (120V) Input Module
Cat. No. 1771-IAD Series C
Specifications
Inputs per Module
Module Location
Nominal Input Voltage
Nominal Input Current
On-state Voltage Range
Minimum On-state Current
Maximum Off-state Voltage
Maximum Off-state Current
Input Impedance
Peak Inrush Current
Input Signal Delay Off to On
16
1771 Series B or later I/O chassis, 1771-AM1, -AM2 chassis
120V ac @ 50/60Hz; 125V dc
9.9mA @ 120V ac 60Hz; 8.7mA @ 120V ac 50Hz; 2.56mA @ 125V dc
79V to 138V ac or dc
5.95mA @ 79V ac 60Hz; 1.5mA @ 79V dc
43V ac or dc
3.0mA @ 43V ac 60Hz; 0.8mA @ 43V dc
11.2K ohms @ 60Hz (0.18 microfarad in parallel with 47K ohms, in series with 820 ohms)
Inrush = V
PS
/820 ohm, where V
PS
= customer supply peak voltage
5ms (+3ms) or 20ms (+5ms) @ 120V ac 60Hz selectable
3ms (+.1ms) or 10ms (+1ms) @ 120V dc selectable
25ms (+5ms) @ 120V ac or dc On to Off
Power Dissipation
Thermal Dissipation
Backplane Current
Isolation Voltage
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Conductors
Keying
Wire Size
Category
8.8 Watts (max.), 1.0 Watts (min.)
30.1 BTU/hr (max.), 3.42 BTU/hr (min.)
195mA @ 5V
Tested at 2500V dc for 1 second per UL508 & CSA C22.2 #142
0 o to 60 o C (32 o to 140 o F)
-40 o to 85 o C (-40 o to 185 o F)
5 to 95% (without condensation)
14 gauge stranded maximum
3/64 inch insulation maximum
1 1
Between 10 and 12
Between 14 and 16
Field Wiring Arm Catalog Number 1771-WH
Wiring Arm Screw Torque
1
Refer to publication 1770-4.1, Programmable Controller Wiring and Grounding Guidelines.
7-9 inch-pounds
Supersedes Publication 1771-2.73 September 1992
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