Overview
Configured for monitoring 24 VDC discrete field signals in Honeywell process control systems, the Honeywell MC-TDID12 51304441-175 (MC-TDID12 32-point Digital Input Module) provides direct electrical input acquisition. The module accepts 32 digital input channels within a 20-30 VDC input power range and evaluates field states through defined pickup and dropout voltage thresholds.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MC-TDID12 51304441-175 |
| Base Model | MC-TDID12 |
| Brand | Honeywell |
| Product Type | 32-Point Digital Input Module |
| Product Parameters | Digital Input, 24 VDC |
| Input Channels | 32 |
| Digital Input Power Range | 20-30 VDC |
| Sense Current | 4.5 mA minimum |
| Pick Up Voltage | 20 VDC minimum |
| Drop Out Voltage | 10 VDC maximum |
| Accumulated Input Frequency DC | 15 Hz |
| Galvanic Isolation | 1500 VAC rms or +/-1500 VDC |
| Origin | USA |
| Weight | 1.15 kg |
| Dimensions | 46.3 x 12.1 x 5.5 cm estimated shipping size |
| Operating Temp | -20 deg C to +60 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Relative Humidity | 5-95% non-condensing |
Channel Isolation and Process Signal Acquisition
The MC-TDID12 51304441-175 uses galvanic isolation rated at 1500 VAC rms or +/-1500 VDC between applicable electrical domains. This isolation arrangement helps separate field-side electrical disturbances from the associated control-system circuitry.
In addition, the module monitors 32 discrete field circuits operating at 24 VDC. A field signal must reach at least 20 VDC for pickup, while the specified dropout threshold is no more than 10 VDC. Therefore, the defined thresholds provide separation between ON and OFF signal states.
The 4.5 mA minimum sense current supports field-state detection, while the specified accumulated DC input frequency of 15 Hz defines the stated input operating characteristic.
Frequently Asked Questions
Q: How many digital input channels does the Honeywell MC-TDID12 51304441-175 provide?
A: The module provides 32 digital input channels for 24 VDC discrete signal monitoring.
Q: What voltage range does the MC-TDID12 51304441-175 accept?
A: The specified digital input power range is 20-30 VDC. The pickup voltage is 20 VDC minimum, and the dropout voltage is 10 VDC maximum.
Q: What isolation specification applies to this module?
A: The provided specification lists galvanic isolation of 1500 VAC rms or +/-1500 VDC. Installation should maintain the required separation between field wiring and other electrical circuits.
Field Installation Guidelines
Install the MC-TDID12 51304441-175 only after isolating the associated control-system and field-circuit power where required by site procedures.
Verify the module orientation and mechanical engagement before applying electrical power. Route 24 VDC discrete input wiring separately from high-voltage power conductors and switching loads to reduce coupled electrical noise.
Terminate each field conductor securely and verify polarity before energization. Where shielded field cable is required by the system installation design, ground the shield according to the applicable Honeywell system grounding arrangement and site electrical standard.
Before commissioning, check the field voltage at the module interface and confirm that active signals meet the specified pickup requirement. Also verify that inactive circuits fall within the specified dropout condition.
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