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ICS Triplex T7481 Monitored Guarded Output Module

Configured for guarded digital output switching in the Trusted safety system, the ICS Triplex T7481 (T7481 Monitored Guarded Output Module) provides 16 monitored 24 VDC output channels with line-fault detection and TMR control.

Hardware Specifications

Parameter	Specification
Model	T7481
Brand	ICS Triplex
Product Type	Monitored Guarded Output Module
Origin	USA
Weight	1.6 kg
Dimensions	Estimated shipping size: 3.2 x 26.4 x 32.6 cm
Output Channels	16 guarded outputs
Output Configuration	2 groups of 8 channels
Output Voltage	24 VDC nominal
Isolation Voltage	Minimum 2500 V
Operating Temp	0 deg C to +60 deg C
Storage Temp	-40 deg C to +85 deg C
Humidity	5 % to 95 % RH, non-condensing
Power Consumption	Not specified in supplied data
Safety Architecture	Trusted TMR
Safetybus Interface	Triplicated
Line Monitoring	Open-circuit and short-circuit detection
Output Switching	Dual-redundant semiconductor switches
Diagnostics	Front-panel LEDs and system status registers
Fuse Access	Front-panel accessible
Tariff Code	8537101190

TMR Safety Output and Fail-Safe Execution

The T7481 uses a triplicated Safetybus interface to receive three independent control data streams. Each stream feeds separate voter circuitry before FPGA-based output control. Therefore, a single system-level data fault does not directly command an unintended field output.

Each output channel uses two series-connected semiconductor switches with independent control signals. This dual-switch arrangement prevents one internal switch fault from directly energizing the field circuit. Furthermore, the module divides its 16 channels into two independent groups of eight channels.

The module also performs continuous line monitoring. Diagnostic circuitry applies low-level test pulses to the field wiring without intentionally actuating the connected load. Consequently, the system can identify open circuits, short circuits, wiring faults, and blown fuses through module indicators and system diagnostics.

Frequently Asked Questions

Q: How many guarded outputs does the T7481 provide?
A: The module provides 16 guarded digital outputs arranged as two groups of eight channels.

Q: Does the T7481 monitor field wiring faults?
A: Yes. The module monitors each output circuit for open-circuit and short-circuit conditions and reports detected faults through diagnostics.

Q: What isolation voltage does the supplied specification identify?
A: The supplied data specifies a minimum isolation voltage of 2500 V. No further test conditions are provided.

Field Installation Guidelines

• Install the module according to the applicable Trusted system hardware installation documentation.
• Verify the module identity and terminal assignments before connecting field wiring.
• Maintain physical separation between output wiring and high-energy power conductors where the installation design requires it.
• Route field wiring so that mechanical stress does not transfer directly to module terminals or connectors.
• Connect cable shields according to the site grounding and EMC design rather than creating unintended ground loops.
• Verify the 24 VDC nominal field supply before commissioning connected loads.
• Check output wiring for continuity and unintended shorts before enabling field circuits.
• Confirm fuse condition and output-channel status using the front-panel indicators and system diagnostics.
• Follow the specified operating temperature and humidity limits during installation and operation.

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