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ICS Triplex T8850C Field Termination Assembly

Configured for field termination of discrete output circuits in the Trusted safety control platform, the ICS Triplex T8850C (T8850 Field Termination Assembly) provides direct electrical interface between controller output modules and field wiring. It supports 40 output channels with 2-wire field connections, DIN rail installation, and screw clamp terminations for field and power conductors. Furthermore, the assembly operates from 24 VDC while maintaining channel-to-bus galvanic isolation.

Hardware Specifications

Parameter	Specification
Model	T8850C
Brand	ICS Triplex
Product Type	Field Termination Assembly
Series	Trusted TMR
Origin	USA
Place of Shipment	Xiamen, China
Manufacturer	ICS Triplex
Weight	0.6 kg
Dimensions	30 x 12.5 x 6.3 cm
Operating Voltage	24 VDC
Output Channels	40
Field Connection	2-wire
Current per Channel	0.5 A continuous
Total Assembly Current	20 A maximum
Voltage Drop	< 0.2 V at 0.5 A
Channel Isolation	1500 V rms channel-to-bus
Mounting Method	Standard DIN rail
Terminal Type	Screw clamp terminals
Operating Temperature	0 to +60 deg C
Storage Temperature	-40 to +85 deg C
Humidity	5 % to 95 % RH, non-condensing
Power Consumption	Not specified by manufacturer

Galvanic Isolation and TMR Safety Interface

The T8850C is designed for operation within the ICS Triplex Trusted TMR safety architecture. Each output channel interfaces with field devices through a dedicated termination path, while 1500 V rms channel-to-bus galvanic isolation limits electrical coupling between the field side and the controller backplane.

The assembly contains 40 independent output terminations, allowing orderly routing of discrete output signals to external equipment. In addition, the DIN rail mechanical format simplifies cabinet integration, while screw clamp terminals provide secure conductor retention for both field wiring and power distribution.

Because the T8850C functions as a passive field termination assembly, it does not execute application logic or redundancy voting. Instead, it provides the physical electrical interface required by Trusted TMR output modules operating within 2oo3 Triple Modular Redundancy (TMR) safety systems.

Frequently Asked Questions

Q: Does the T8850C perform output switching or signal processing?
A: No. The T8850C is a passive Field Termination Assembly. Output switching and diagnostics remain within the associated Trusted output module.

Q: Can the assembly be mounted directly inside a standard industrial control cabinet?
A: Yes. The unit is designed for standard DIN rail installation and uses screw clamp terminals for field and power wiring.

Q: Does the T8850C provide electrical isolation?
A: Yes. The assembly provides 1500 V rms channel-to-bus isolation, helping separate field-side circuits from the controller interface.

Field Installation Guidelines

• Verify that the installed output module matches the designated T8850C field termination assembly before connecting field wiring.
• Disconnect cabinet power before installing or removing field conductors.
• Route output wiring separately from high-energy AC power cables to reduce electromagnetic coupling.
• Connect protective earth and cable shields according to the control system grounding philosophy.
• Tighten screw clamp terminals using the torque specified in the system installation documentation.
• Confirm conductor identification before energizing the system, and verify continuity after installation.
• Inspect DIN rail engagement to ensure the assembly is fully secured before connecting field devices.

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