Rockwell Automation T7446L User Manual

ICS Regent+Plus
®
PD-7017
Relay Output Modules
Low Power and High Power
(T7446L and T7446H)
Issue 1,
Relay output modules provide control of eight user output loads. Two types of relay output modules are available providing dry contact relay clos variety of AC and DC voltages to field loads. 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.
ure outputs for switching a
March, 06
Features
·
Eight isolated, dry contact relay outputs: four Form-C, and four form-A or Form-B selectable.
·
Hot replaceable.
·
Automatic self-testing of triplicated I/O Safetybus circuits and many simplex logic circuits.
·
High power modules (T7446H) operate up to 250 VAC/125 VDC switching loads rated at 500 VA or 100 Watts.
·
Low power modules (T7446L) operate up to 125 VAC/VDC switching loads rated at 60 VA or 30 Watts.
·
Individual front panel indicators on each module show active and fault status, shutdo side).
·
TÜV certified, Risk Class 5, non-interfering.
wn state, and output status (logic
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Module Operation

A block diagram of a typical relay 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 operatio then passed to the I/O bus interface logic.
n). The voted result is
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Figure 1. Block Diagram of a Relay Output Module.
The voted output data from the I/O bus interface logic is then used to drive the output circuits. Logic output drive signals energize the coils of relays mounted on the printed circuit board. Relay contacts provide dry-contact switching of load devices.
When the output is logically turned on, the relay coil is energized (closing the N.O.
contact), and when the output is
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logically turned off, the relay coil is de-energized (closing the N.C. contact).
The relay provides logic-to-field isolation between the module’s logic and field circuits — protecting the output module from field signal over voltages, transients, and other electrical disturbances.
Both types of relay output module use UL 508 approved relays.
Relay Output Modules

Testing and Diagnostics

Each module’s voter circuits are periodically tested by the processor modules. Discrepant data are sent throug 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 m 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.
odule and its points specifically. If a

Front Panel Indicators

h one of
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The relay output module is shown in Figure 2. The front panel contains active and fault status indicators, a shutdown indicator, and output status indicators for each output circuit.

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 indicator turns off.
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Note:
Relay Output Modules
(T7446L, H)

Shutdown Indicator

Upon loss of communications with the controller, output modules enter either a shutdown or hold fault mode. If the I/O assembly is set to shutdown, the red SHUTDOWN indicator will turn on when communications with the controller are lost. If the I/O assembly is set to hold, the SHUTDOWN indicator will always be off (see page 11, Fault Mode Jumper).
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 mo
dules, 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 logic-side (coil) of the relay output. There are eight output status indicators
— one for each output. These indicators are lit when the output relay coil is energized, closing the normally open contact.
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Figure 2. Relay Output Module.
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Application

Simplex Configuration

Relay o critical 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 relay 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 fault tolerant output configurations, Guarded digital output modules should be used.
utput modules provide a suitable interface to non
-
or
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Figure 3. Simplex Relay Output Configuration.

Field Wiring

For field wiring details, refer to PD-7901 - I/O Termination Assembly (ITA).
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Jumper
Form
Description
E110
NO1
Selects normally open for relay 1
E111
NC1
Selects normally closed for relay 1
E120
NO2
Selects normally open for relay 2
E121
NC2
Selects normally closed for relay 2
E170
NO7
Selects normally open for relay 7
E171
NC7
Selects normally closed for relay 7
E180
NO8
Selects normally open for relay 8
E181
NC8
Selects normally
closed for relay 8
Relay Output Modules

Relay Operation

The relays used on the T7446L contain SPDT contacts. For the Form-A or Form-B selectable outputs, a jumper in the module is used to select Form-A (N.O.) or Form-B (N.C.) action.
The relays used on the T7446H contain t (one normally closed and one normally open). Jumpers within the module are also used to select the relay form. On the Form-C output, there is no guarantee for make-before-break or break-before-make.

Output Form Selection

Two sets of jumper posts are used to select the output form for the selectable relays. The jumper locations are shown in Figure 4. The jumper post designations are shown in Table 1.
Only one jumper shunt can be installed for each relay. The modules are shipped with the jumpers positioned for normally open contact outputs.
wo SPST contacts
Table 1. Jumper Designations.
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8
Figure 4. Jumper Locations.

Operating Envelope

Figure 5 shows the voltage and current operating envelopes for the T7446L and T7446H. The T7446L relays are initially gold clad and have an initial resistance of 50 mOhm maximum. However, operation at high voltages and currents will remove the gold and the closed resistance will increase substantially. This increased resistance reduces its ability to subsequently s
witch very low power loads.
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Relay Output Modules
As with any relay, operating at higher voltages and currents will result in decreased relay life. Figure 6 shows the voltage and current versus service life for the relays.
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Figure 5. Voltage and Current Operating Envelopes.
9
10
100
1000
10000
100000
0
0.4 0.8 1.2 1.6
2
2.4
10
100
1000
10000
100000
0
0.4 0.8 1.2 1.6
2
2.4
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Figure 6. Voltage and Current vs. Service Life.

Relay Protection

Each relay circuit must be fused externally to protect the relay and the load. Modules are also fused internally with factory-replaceable fuses to protect the I/O assembly and the module’s printed circuit board.
If an inductive load is connected, a suitable snubber must be externally provided.
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Module
Upper
Connector
Lower
Connector
T7446H
T7446L
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Relay Output Modules

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 m (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 7 illustrates how the slot keys are installed on the I/O chassis slot field wiring connectors. The slot key pos Table 2. Both versions of the relay output module use the same slot key positions.
odules in the I/O chassis to either shutdown
itions for the relay output module are listed in
Table 2. Slot Key Positions.
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Figure 7. Installing Slot Keys.

Configuration

Each output module is configured using the
W
INTERPRET
I/O Configuration Editor. In the editor you will perform the three steps described below to co
nfigure the output module.
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Relay Output Modules
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 relay 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 8. Relay 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 9. 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

Comm Protect

not affect application program operation).
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 th
at 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 eight output points. The module definition represents the eight output point definitions as signed, 16-bit integers. In this format, the eight outputs are the least significant bits with output point 1 as the LSB. The eight most significant bits are always zero.

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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control logic by using a contact element (or similar element) with the output point name.
Relay Output Modules

Maintenance

No periodic maintenance or calibration is required for this module. If a module is to be replaced, verify the replacement module’s relay form configuration matches the original relay output module.
Fuses for each output are located inside the module.
fuses are for protection of the I/O chassis connectors and module circuit board only, and are not field-replaceable
Should an internal fuse blow, it indicates that the module is being used for output loads in excess of the safe r module and the I/O chassis.
Modules with blown fuses should be returned to ICS for repair or replacement.

Safety Considerations

The relay output modules are TÜV certified as non
interfering, 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 T7481, T7484, T7485 or T7488 are recommended).
These
.
ating of the
-
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Safetybus Power
1.0 load units
Number of Outputs
Eight isolated c
ircuits (four Form-C contacts, four selectable N.O. or N.C. contacts)
T7446L
T7446H
Voltage Range
0.1 to 125 VAC/DC
5 to 250 VAC 5 to 125 VDC
Load Current
2.0 amps
2.0 amps
Minimum Load
0.1 VDC/10 mA
5 VDC/10 mA
Surge Current
20 amps, 16 msec
20 amps, 16 msec
Over Voltage Protection
750 VAC, 1 minute
1000 VAC, 1 minute
Rated Load
resistive
110 VAC, 0.3 amps 24 VDC, 1 amp
250 VAC, 2 amps 50 VDC, 2 amps
inductive
110 VAC, 0.2 amps 24 VDC, 0.3 amp
250 VAC, 2 amps 30 VDC,
2 amps
Maximum Switching
resistive
60 VA, 30 W
500 VA, 100 W
inductive
20 VA, 10 W
500 VA, 60 W
Contact Resistance
50 mOhms, initial
30 mOhms, initial
Breakdown Voltage
Logic to field Same channel Chnl to chnl
1000 VAC 750 VAC 2500 VAC
2000 VAC 1000 VAC 2500 VAC
Turn-On Delay
5 msec
10 msec
Turn-Off Delay
2 msec
10 msec
Heat Dissipation
4.5 Watts, 15 BTUs/hour
4.5 Watts, 15 BTUs/hour
Relay Output Modules
(T7446L, H)

Specifications

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Fusing (internal)
One 3.5 A, slow blow per output
Note:
Internal fuses are for
protection of the printed cir
­cuit board only. Each output should be individually fused outside the module with a fuse rated for the output load.
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
IEC 801 Part 2 - Electrostatic Discharges
IEC 801 Part 3 - Radiated Electromagnetic Fields
ANSI/IEEE C37.90 - Surge Withstand Capability
Level 3: Contact discharge of 6 kV Level 3: 10 V/M, 27 MHz ­500 MHz 1 kV damped 1 MHz sine wave
Safety
Certified to DIN V VDE 0801 (non-interfering) and design
ed to meet UL 508 and
CSA 22.2, No. 142-M1981
Dimensions
Height: Width: Depth:
12.6" (320 mm)
1.27" (32 mm)
10.12" (257 mm)
Weight
4.0 lbs (1.8 kg)
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