Honeywell MC-TPIX12 Pulse Input Field Termination Assembly Module
The Honeywell MC-TPIX12, also cataloged as the MC-TPIX12 Pulse Input Field Termination Assembly (FTA), operates as a dedicated hardware component for pulse signal acquisition and frequency processing within Honeywell distributed control platforms. The module routes high-speed pulse trains, rectangular pulses, and sine wave signals from field-mounted pulse-generating sensors directly into host control cards. Internal signal conditioning logic performs rate calculation, pulse width evaluation, and contact condition diagnostics across 8 independent input channels. Built-in overvoltage protection and automatic current limiting maintain loop integrity during field line transients or transmitter fault conditions.
Suffix Breakdown & Model Matrix
| Part Number / Prefix | Base Model | Assembly Description | Channel Count |
|---|---|---|---|
| MC-TPIX12 | MC-TPIX12 | Pulse Input Field Termination Assembly (FTA) | 8 Input Channels |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MC-TPIX12 |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.5 kg |
| Dimensions | Standard DIN-rail / Rack FTA layout |
| Operating Temp | -40 to 70 deg C |
| Power Consumption | 24 VDC nominal (Transmitter supply: 23-25 VDC open circuit) |
| Input Channels | 8 pulse input channels |
| Input Impedance | Minimum 10 kOhm |
| Input Frequency Range | 4 Hz to 20 kHz (all channels with uniform amplitude) |
| Signal Pulse Levels | Low: -0.5 V to +1.5 V; High: +3.5 V to +24 V (with hysteresis) |
| Rate Accuracy | +/-0.01% of input frequency or +/-0.4 Hz (whichever is larger) |
| Rate Resolution | 0.4 Hz |
| Field Input Scan Rate | 20 ms |
| PV Update Rate | 90 ms for 5 channels |
| Short Circuit Protection | 45 mA maximum short circuit current limiting |
Channel-to-Channel Isolation & Cold Junction Compensation
The MC-TPIX12 incorporates high-density channel conditioning and signal isolation to eliminate ground loops in noise-intensive process environments. Analog current loop transceivers and pulse discrimination stages isolate the field-side terminal connections from internal backplane communication lines. Integrated power conditioning delivers 24 VDC short-circuit-protected loop power to 2-wire field transmitters, while automatic current limiting clamps fault currents below 45 mA. High-speed signal filtering circuitry provides high common-mode voltage rejection and FSK carrier rejection across active pulse measurement loops.
Frequently Asked Questions
Q: How do the IOF filter jumpers affect the minimum readable pulse width on input channels?
A: Minimum pulse width depends on jumper placement: the H position allows 5 us minimum at 40 kHz, the storage position allows 25 us minimum at 22 kHz, and the L position filters signals to 520 us minimum at 1 kHz.
Q: What overvoltage limits can the pulse input channels withstand without physical damage?
A: Channel input circuits feature built-in overvoltage suppression configured to tolerate steady-state input signals up to +30 VDC without component failure.
Q: Can both 2-wire self-powered and loop-powered sensors be wired to the same FTA unit?
A: Yes, the module terminal block supports both self-powered 2-wire sensors and powered 2-wire PM/AP/HFM sensors via onboard transmitter power conditioning rails.
Field Installation Guidelines
- Mount the MC-TPIX12 FTA chassis onto the enclosure mounting rail, securing mechanical grounding tabs to the cabinet frame.
- Set the IOF filter jumpers for each channel to the required frequency position (H, L, or Storage) prior to connecting field cables.
- Terminate field pulse sensor wiring using individually shielded twisted-pair cables, connecting shield drain wires to the cabinet technical ground bar at a single terminal point.
- Verify field wiring voltage levels with a multimeter to ensure signal amplitudes fall within the -0.5 V to +24 V operating threshold.
- Connect primary 24 VDC loop supply power to the FTA power terminals and confirm open-circuit supply outputs measure between 23 VDC and 25 VDC.
Honeywell MC-TPIX12 Pulse Input Field Termination Assembly Module
Honeywell MC-TPIX12 Pulse Input Field Termination Assembly Module
The Honeywell MC-TPIX12, also cataloged as the MC-TPIX12 Pulse Input Field Termination Assembly (FTA), operates as a dedicated hardware component for pulse signal acquisition and frequency processing within Honeywell distributed control platforms. The module routes high-speed pulse trains, rectangular pulses, and sine wave signals from field-mounted pulse-generating sensors directly into host control cards. Internal signal conditioning logic performs rate calculation, pulse width evaluation, and contact condition diagnostics across 8 independent input channels. Built-in overvoltage protection and automatic current limiting maintain loop integrity during field line transients or transmitter fault conditions.
Suffix Breakdown & Model Matrix
| Part Number / Prefix | Base Model | Assembly Description | Channel Count |
|---|---|---|---|
| MC-TPIX12 | MC-TPIX12 | Pulse Input Field Termination Assembly (FTA) | 8 Input Channels |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MC-TPIX12 |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.5 kg |
| Dimensions | Standard DIN-rail / Rack FTA layout |
| Operating Temp | -40 to 70 deg C |
| Power Consumption | 24 VDC nominal (Transmitter supply: 23-25 VDC open circuit) |
| Input Channels | 8 pulse input channels |
| Input Impedance | Minimum 10 kOhm |
| Input Frequency Range | 4 Hz to 20 kHz (all channels with uniform amplitude) |
| Signal Pulse Levels | Low: -0.5 V to +1.5 V; High: +3.5 V to +24 V (with hysteresis) |
| Rate Accuracy | +/-0.01% of input frequency or +/-0.4 Hz (whichever is larger) |
| Rate Resolution | 0.4 Hz |
| Field Input Scan Rate | 20 ms |
| PV Update Rate | 90 ms for 5 channels |
| Short Circuit Protection | 45 mA maximum short circuit current limiting |
Channel-to-Channel Isolation & Cold Junction Compensation
The MC-TPIX12 incorporates high-density channel conditioning and signal isolation to eliminate ground loops in noise-intensive process environments. Analog current loop transceivers and pulse discrimination stages isolate the field-side terminal connections from internal backplane communication lines. Integrated power conditioning delivers 24 VDC short-circuit-protected loop power to 2-wire field transmitters, while automatic current limiting clamps fault currents below 45 mA. High-speed signal filtering circuitry provides high common-mode voltage rejection and FSK carrier rejection across active pulse measurement loops.
Frequently Asked Questions
Q: How do the IOF filter jumpers affect the minimum readable pulse width on input channels?
A: Minimum pulse width depends on jumper placement: the H position allows 5 us minimum at 40 kHz, the storage position allows 25 us minimum at 22 kHz, and the L position filters signals to 520 us minimum at 1 kHz.
Q: What overvoltage limits can the pulse input channels withstand without physical damage?
A: Channel input circuits feature built-in overvoltage suppression configured to tolerate steady-state input signals up to +30 VDC without component failure.
Q: Can both 2-wire self-powered and loop-powered sensors be wired to the same FTA unit?
A: Yes, the module terminal block supports both self-powered 2-wire sensors and powered 2-wire PM/AP/HFM sensors via onboard transmitter power conditioning rails.
Field Installation Guidelines
- Mount the MC-TPIX12 FTA chassis onto the enclosure mounting rail, securing mechanical grounding tabs to the cabinet frame.
- Set the IOF filter jumpers for each channel to the required frequency position (H, L, or Storage) prior to connecting field cables.
- Terminate field pulse sensor wiring using individually shielded twisted-pair cables, connecting shield drain wires to the cabinet technical ground bar at a single terminal point.
- Verify field wiring voltage levels with a multimeter to ensure signal amplitudes fall within the -0.5 V to +24 V operating threshold.
- Connect primary 24 VDC loop supply power to the FTA power terminals and confirm open-circuit supply outputs measure between 23 VDC and 25 VDC.
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