ICS Regent
®
PD-6015
DC Digital Output Module
24 VDC
(T3441A)
Issue 1, March, 06
The DC digital output module provides control of 16 user
output loads. One type of module is available to interface to
outputs powered from a nominal 24 VDC field power supply.
Each module's triplicated I/O Safetybus interface ensures that
no Regent system failure can incorrectly apply power to an
output, and that no failure in the module can affect the
operation of the Regent system or other I/O modules in the
system.
Features
·
Sixteen output circuits, configured as two isolated groups of
eight circuits each.
·
Hot-replaceable.
·
Automatic self-testing of triplicated I/O Safetybus circuits and
many simplex logic circuits.
·
2 amp output circuits.
·
Individual front panel indicators on each module show
active/fault, shutdown, blown fuse, and output on/off status
(field side).
·
2500 volt minimum electrical isolation between field and logic
circuits.
·
TÜV certified, Risk Class 5, non-interfering.
Industrial Control Services
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DC Digital Output Module (T3441A)
Module Operation
A block diagram of a typical 24 VDC digital output module is
shown in Figure 1.
The processor modules send triplicated write data commands
to the output module over the I/O Safetybus. The processors’
addressing data and data write commands are voted by the
module (preventing I/O Safetybus failures upstream from the
module from affecting module operation). The voted result is
then passed to the I/O bus interface logic.
Figure 1. Block Diagram of 24 VDC Digital Output Module.
The voted output data from the I/O bus interface logic is then
used to drive the output circuits. Power MOSFETs are used
on the outputs to convert the logic level output drive signals
to switch 24 VDC power to load devices. These output circuits
provide a very low on state voltage drop and low off state
leakage.
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When the output is logically turned on, the field device is
energized, and when the output is logically turned off, the
field device is de-energized.
Optical isolation between the module’s logic and field circuits
provides logic-to-field isolation — protecting the output
module from field signal over voltages, transients, and other
electrical disturbances. It also provides a safety barrier
between the primary field voltages and user accessible
circuits.
Each output is individually fused to protect the circuits from
short circuit conditions in output wiring and field devices.
Testing and Diagnostics
Each module’s voter circuits are periodically tested by the
processor modules. Discrepant data are sent through one of
three legs of the I/O Safetybus to determine whether the
module’s voter is able to outvote the incorrect data. A failure
to return the correct majority-voted result to the processors
produces an I/O module error indication at the processor
modules and a module fault indication at the I/O module.
Each type of module has a unique identification code that is
read by the controller. This code lets the controller know
which type of module is installed in each I/O chassis slot and
how to address that module and its points specifically. If a
module is removed, or is replaced with a module of a different
type, the processor modules will indicate an I/O module error.
Loopback logic tests periodically write data to the module and
then read it back to determine whether the module’s I/O bus
interface logic is functioning correctly.
Fuses are continually checked for continuity. Field power
must be connected to the output module in order for it to
detect a blown fuse.
Front Panel Indicators
The 24 VDC digital output module is shown in Figure 2. The
front panel contains active and fault status indicators, a
shutdown indicator, blown fuse indicators (one per output
group) and an output status indicator for each output circuit.
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Mar-06
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DC Digital Output Module (T3441A)
Active and Fault Status Indicators
These green and red LEDs indicate the overall health of the
module. During normal operation, the green ACTIVE
indicator flashes at the controller’s scan rate. If a module
fault is detected the red FAULT indicator turns on and the
green ACTIVE indicator turns off.
Shutdown Indicator
Upon loss of communications with the controller, output
modules enter either a shutdown or hold fault mode. If the I/O
unit is set to shutdown, the red SHUTDOWN indicator will
turn on when communications with the controller are lost. If
the I/O unit is set to hold, the SHUTDOWN indicator will
always be off (see page 8, Fault Mode Jumper).
Note: When the module is installed in the I/O chassis or when logic
power (from the I/O power supply modules) is first applied to
the module, it will be in the shutdown mode until the first
output scan, regardless of the fault mode jumper settings.
Also, removing two I/O transceiver modules, two I/O power
supply modules, or two power legs will cause the module to be
in the shutdown mode.
Output Status Indicators
The output status indicators are yellow LEDs, located on the
field side of the output. There are 16 output status indicators,
— one for each output. These indicators are lit when the
output FET is energized to turn on the load.
Blown Fuse Indicators
The red BLOWN FUSE indicators turn on when one of the
fuses in the corresponding output group opens. A blown fuse
will also cause the module’s FAULT indicator to turn on.
Field power must be connected to the module for it to detect a
blown fuse. Refer to Maintenance, page 12, for fuse
replacement instructions.
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Figure 2. 24 VDC Digital Output Module.
PD-6015
Mar-06
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DC Digital Output Module (T3441A)
Application
Simplex Configuration
Digital output modules provide a suitable interface to noncritical output devices. These non-critical devices typically
include status alarms or other field devices that are not used
for primary safety shutdown purposes. Although much of the
circuitry on the digital output module is automatically tested,
some logic circuits and the field-side output switch are simplex
and non-tested. This simplex configuration is illustrated in
Figure 3. For safety-critical outputs requiring fail-safe or
fault tolerant output configurations, Guarded digital output
modules should be used.
Figure 3. Simplex Digital Output Configuration.
Field Wiring
Field wiring terminal blocks on the I/O chassis are used to
connect power sources and loads to the module. The terminal
blocks are located directly above and below the slot where the
module is installed. Each terminal block consists of ten #6
wire clamp screw terminals capable of holding two 12 AWG
wires.
Each module has separate 24 VDC power terminals for each
output group (group 1: channels 1-8, group 2: channels 9-16).
The two groups are electrically isolated from each other (2500
volts minimum). Figure 4 shows the proper field wiring
connections for the 24 VDC digital output module.
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Figure 4. Module Wiring.
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DC Digital Output Module (T3441A)
Fault Mode Jumper
The fault mode jumper is located behind the ID switch cover
in the lower left-hand corner of each I/O chassis. The position
of the fault mode jumper determines the module's response to
system level faults. The fault mode jumper’s position will
cause all output modules in the I/O chassis to either shutdown
(turn off all outputs) or to hold (hold the last state) after a
system level failure occurs. An example of a system level
failure is the failure of two processor modules.
Keying
The I/O chassis can be physically keyed to prevent accidental
damage caused by inserting a module into a slot wired for a
different module type. Figure 5 illustrates how the slot keys
are installed on the I/O chassis slot field wiring connectors.
The slot key positions for the DC digital output module are
listed in Table 1.
Table 1. Slot Key Positions.
8
Module
Upper
Connector
Lower
Connector
T3441A
10
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Figure 5. Installing Slot Keys.
Configuration
Each output module is configured using the WINTERPRET I/O
Configuration Editor. In the editor you will perform the three
steps described below to configure the output module.
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Mar-06
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DC Digital Output Module (T3441A)
1) Set the Module Type:
Position the cursor on the module slot you wish to define.
Choose Set Module Type from the Edit Menu and select
the appropriate digital output module from the list.
2) Edit the Module Definition:
Choose Edit Module Definition from the Edit Menu. A
dialog box will open where you can define the output point
definitions.
Figure 6. Digital Output Module Definition.
3) Edit each point:
Choose Edit from the Module Definition dialog box to
define a name and description for each output point. In
the Digital Output Point dialog, enter names and values
for the configuration fields as described below.
Figure 7. Defining a Digital Output Point.
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Name
Also called the tag name, this is the name used in the
application program to reference the output point. The name
can be up to 12 characters long.
Description
This 40-character field provides a place to describe the output
point definition. The description is used to help document
your system (it does not affect application program operation).
Comm Protect
Marking the Comm Protect check box protects the point from
changes by communications functions such as data write,
forcing, and load initial value when Comm Protect is enabled.
Initial Value
The initial value for the output is loaded to the Regent when
you load the I/O configuration and also when you load the
application program that controls the output.
Final Value
The final value for the output is loaded to the Regent when
the application program that controls the output is deleted.
Unless special circumstances exist, you should always enter
zero, so that the output is turned off when you delete the
application program that controls it.
Output Module Definition
In addition to configuring output point definitions, you can
configure an output module definition to represent the
combined state of all sixteen output points. The module
definition represents the 16 output point definitions as signed,
16-bit integers. In this format, output point 1 is the least
significant bit (LSB) and output point 16 is the most
significant bit (MSB).
Programming
Outputs are controlled by writing application programs that
solve for output values. For example, placing an output tag
name on a coil in ladder logic will cause the output to turn on
when there is power flow to the coil in the ladder logic rung.
You can also reference the logic state of the output in your
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Mar-06
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DC Digital Output Module (T3441A)
control logic by using a contact element (or similar element)
with the output point name.
Maintenance
No periodic maintenance or calibration is required for this
module.
Fuses for each output are located within the module. To
replace a blown fuse the output module must be removed from
the I/O chassis and opened. To open the output module,
remove four screws from the side of the module’s clamshell.
Remove the blown fuse from its retaining clips (on the circuit
board) and replace it.
To prevent damage to the module, replacement fuses must be
of the same rating and type (see Specifications, below).
To prevent electrostatic damage to sensitive module circuits,
maintenance personnel should always use the proper antistatic work areas and grounding straps when handling or
working with circuit boards.
Safety Considerations
The DC digital output module is TÜV certified as noninterfering, and can be used in a safety system for simplex
non-safety critical outputs. For safety critical outputs,
guarded output modules should be used (model T3461A,
T3481 or T3485 are recommended).
Specifications
12
Safetybus Power
0.8 load units
Number of Outputs
16 circuits divided into two
groups of 8 circuits each
Voltage Range
18 to 30 VDC
Load Current
2 amps maximum per output
0° to 60° C
Industrial
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(T3441A) DC Digital Output Module
Minimum Load
0 mA
On State Drop
0.5 volts maximum @ 2 amps
Surge Current
15 amps, 20 msec
Output Leakage
1 mA maximum
Fusing
One 3 A, 250 V, fast-acting
(3AG) per output, located
inside module
Turn-On Delay
1.0 msec, maximum
Turn-Off Delay
1.0 msec, maximum
Heat Dissipation
16 Watts, 54 BTUs/hour
Over voltage Protection
45 VDC, continuous
Isolation
2500 volts minimum (field
wiring to control logic)
2500 volts minimum (output
group 1-8 to output group 916)
Operating Temperature
0° to 60° C
(32° to 140° F)
Storage Temperature
-40° to 85° C
(-40° to 185° F)
Operating Humidity
0 to 95% relative humidity,
non-condensing
Vibration
10 to 55 Hz:
±0.15mm
Shock
Operating:
15 g, ½ sine wave, 11 msec
Electromagnetic
Interference
•
•
PD-6015
Mar-06
IEC 801 Part 2 - Electrostatic
Discharges
IEC 801 Part 3 - Radiated
Electromagnetic Fields
Level 3: Contact discharge of
6 kV
Level 3: 10 V/M, 27 MHz 500 MHz
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DC Digital Output Module (T3441A)
Safety
Certified to DIN V VDE
0801 (non-interfering) and
designed to meet UL 508 and
CSA 22.2, No. 142-M1981
Dimensions
Height:
Width:
Depth:
Weight
14
12.6" (320 mm)
1.27" (32 mm)
10.12" (257 mm)
3.5 lbs (1.6 kg)
Industrial
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