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Honeywell TC-MUX021 Serial Interface Module

Configured for dual-channel serial data exchange in Honeywell Experion PKS and TDC 3000 platforms, the Honeywell TC-MUX021 (51404391-375) (TC-MUX021 Serial Interface Module) provides direct physical and electrical execution for bidirectional communication between control processors and external serial devices.

Hardware Specifications

Parameter	Specification
Model	TC-MUX021
Brand	Honeywell
Part Number	51404391-375
Product Type	Serial Interface Modules
Origin	USA
Weight	Approx. 0.3 kg to 0.5 kg
Dimensions	Approx. 110 mm x 90 mm x 60 mm
Operating Temp	-40 deg C to +70 deg C
Storage Temp	-40 deg C to +85 deg C
Power Consumption	Maximum 10 W
Operating Voltage	24 VDC
Channel Configuration	2 independent serial channels
Module Form Factor	Double-width I/O chassis module
Backplane Current	1.3 A at 5.1 VDC; 1.0 A at 3.3 VDC; 5.6 mA at 1.2 VDC; 4 mA at 24 VDC
Communication Interface	EIA-232 / RS-232C/D and EIA-485 / RS-485 through compatible FTAs
Supported Protocols	Modbus RTU, Allen-Bradley DF1, and custom serial protocols
Humidity Range	5% to 95% non-condensing
Protection Rating	IP20
Hazardous Location Rating	Class I, Division 2, Groups A, B, C, D, Temp Code T4A

DCS Serial Communication and Signal Interface Characteristics

The TC-MUX021 performs serial signal processing between Honeywell control processors and external subsystems through Field Termination Assemblies. The module provides two independent serial communication channels with bidirectional data transfer capability.

The module supports serial protocol conversion and transparent communication functions for external devices requiring RS-232 or RS-485 physical connections. Moreover, the serial processing workload is separated from the primary controller execution layer, allowing dedicated communication handling within the I/O subsystem.

For Honeywell process control installations, communication paths may include Modbus RTU devices, analyzer systems, variable frequency drives, flow measurement equipment, and other serial-based instruments. Channel-to-channel electrical separation is maintained through the module hardware design to support distributed process signal integration.

Frequently Asked Questions

Q: How many serial communication channels are available on the TC-MUX021?

A: The TC-MUX021 provides two independent serial communication channels for bidirectional data exchange through compatible Field Termination Assemblies.

Q: What type of physical serial interfaces are supported by this module?

A: The module supports EIA-232 and EIA-485 physical interfaces through applicable FTAs for connection with external serial devices.

Q: What power requirements must be considered during chassis installation?

A: The module requires chassis power evaluation based on its backplane current consumption values, including 1.3 A at 5.1 VDC and 1.0 A at 3.3 VDC.

Field Installation Guidelines

Install the TC-MUX021 in the designated Honeywell I/O chassis slot according to the system hardware configuration documentation.

Verify that the chassis power supply capacity supports the module backplane load before installation. Use approved Field Termination Assemblies for external serial wiring connections.

Maintain proper cable routing separation between serial communication wiring and high-voltage power conductors to reduce electrical interference. Apply shielded communication cables where required, and connect cable shields according to the site grounding standard.

Confirm RS-232 or RS-485 wiring polarity before commissioning. Check communication parameters, including baud rate, parity, and protocol configuration, before enabling data exchange with external devices.

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