Overview
The Honeywell TK-MUX021, also cataloged as the TK-MUX021 2-Channel User-Configurable Serial Interface Module (SIM), provides serial data communication between Honeywell Experion PKS control hardware and compatible third-party devices. It supports RS-232D and RS-422/485D physical interfaces, with protocol selection through compatible Field Termination Assemblies (FTAs). The supplied specifications list a maximum communication speed of 19.2 kb/s per FTA.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | TK-MUX021 |
| Brand | Honeywell |
| Power Consumption | Approximately 10 W |
| Product Type | 2-Channel User-Configurable Serial Interface Module |
| Communication Channels | 2 independent serial communication channels |
| Physical Interfaces | EIA RS-232D (DB-25); EIA RS-422/485D (5-terminal compression connection) |
| Maximum Communication Speed | 19.2 kb/s per FTA |
| Supported Protocols | Modbus; Allen-Bradley DF1 |
| Modbus FTA | MU-TSIM12 |
| Allen-Bradley DF1 FTA | MU-TSIA12 |
| Environmental Protection | Conformal coating, according to supplied product information |
| Operating Vibration Resistance | 5 g, 10-50 Hz |
| Operating Shock Resistance | 30 g peak, 11 ms duration |
| System Compatibility | Honeywell Experion PKS, Series-A I/O, C200/C200E controllers |
Serial Communication and DCS Integration
The TK-MUX021 handles serial communication through two independent channels. Each channel uses a compatible FTA to provide the required physical interface and protocol configuration.
- RS-232D: Uses a DB-25 connector for compatible serial devices.
- RS-422/485D: Uses a 5-terminal compression connection for compatible differential serial interfaces.
- Modbus: Requires the MU-TSIM12 FTA according to the supplied specifications.
- Allen-Bradley DF1: Requires the MU-TSIA12 FTA according to the supplied specifications.
- Communication rate: The stated maximum is 19.2 kb/s per FTA. Actual throughput depends on protocol settings, connected devices, and communication conditions.
The TK-MUX021 is identified as a conformally coated version of the TC-MUX021. Confirm the hardware revision and FTA compatibility before replacing an installed module.
Frequently Asked Questions (FAQ)
Q: Can the TK-MUX021 communicate with two serial devices simultaneously?
A: The module is specified with two independent communication channels. Simultaneous operation depends on the configured FTAs, protocol settings, controller configuration, and connected devices.
Q: Which FTAs are specified for Modbus and Allen-Bradley DF1?
A: The supplied information identifies the MU-TSIM12 FTA for Modbus and the MU-TSIA12 FTA for Allen-Bradley DF1. Verify the required interface and system compatibility before installation.
Q: Is the TK-MUX021 hot-swappable?
A: Hot-swap support is not established by the supplied specifications. Check the applicable Honeywell hardware installation and maintenance documentation before removing or inserting the module while the system is energized.
Field Installation Guidelines
- Verify module compatibility: Confirm that the TK-MUX021 matches the controller platform, chassis, and installed system configuration.
- Check the FTA: Select the FTA that matches the required protocol and physical interface.
- Inspect serial wiring: Verify connector pin assignments, signal polarity, and interface type against the hardware documentation.
- Route communication cables: Separate serial signal cables from high-voltage wiring and sources of electromagnetic interference where practical.
- Apply grounding and shielding: Follow the manufacturer’s grounding instructions. Terminate cable shields according to the installation design to reduce noise and avoid unintended ground loops.
- Verify communication settings: Check baud rate, parity, data bits, stop bits, and protocol parameters at both ends of the serial link.
- Validate operation: Confirm channel communication, controller diagnostics, and connected-device responses before returning the system to normal service.
- Observe environmental limits: Use verified manufacturer specifications for temperature, humidity, vibration, and shock requirements. Do not infer unlisted operating limits from the conformal coating designation.
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