Honeywell 51402755-100 51304848-100 51305099-100 Input Module
The Honeywell 51402755-100, also cataloged as the 51402755-100 Digital Input Module (associated with board numbers 51304848-100 and 51305099-100), operates as a dedicated hardware component for 24 VDC discrete signal acquisition within Honeywell DCS and process automation platforms. It directly monitors field switches, relay contacts, and proximity sensors across 16 channels while enforcing fail-safe state execution during power loss or communication interrupts.
Suffix Breakdown & Model Matrix
| Base Part Number | Associated Board / Sub-Assembly | Function / Hardware Level |
|---|---|---|
| 51402755-100 | 51304848-100 | Primary Digital Input Module Assembly |
| 51402755-100 | 51305099-100 | Sub-Assembly / Printed Circuit Board Component |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 51402755-100 (51304848-100 / 51305099-100) |
| Brand | Honeywell |
| Origin | United States |
| Weight | 0.5 lbs (0.23 kg) |
| Dimensions | 1.7 x 2.5 x 3.5 in (4.4 x 6.4 x 8.9 cm) |
| Operating Temp | Standard Industrial Operating Range |
| Power Consumption | Less than 100 mA |
| Number of Channels | 16 Digital Input Channels |
| Nominal Input Voltage | 24 VDC |
| Input Voltage Range | 3 to 36 VDC |
| Input Current | 10 mA per channel |
| Auxiliary Output | 24 VDC @ 100 mA |
Channel-to-Channel Isolation and HART Loop Integration
Designed for dense process control cabinets, the module features robust channel-to-channel isolation and galvanic signal filtering to prevent field noise, high-voltage transients, and ground loops from affecting backplane logic. The hardware maintains fail-safe state execution under fault conditions while seamlessly interfacing with Honeywell process networks. Integrated noise filtering and cold junction compensation (CJC) processing across adjacent I/O cards protect low-level signal paths and ensure deterministic data transmission alongside 4-20 mA HART loop protocol networks.
Frequently Asked Questions
Q: How does the fail-safe design of the 51402755-100 function during communication loss?
A: Upon detecting a backplane communication timeout or primary power loss, the input module forces channel state registers into a predetermined fail-safe default state to ensure predictable controller behavior and prevent false process trips.
Q: What input voltage thresholds are supported on the 16 channels?
A: Each channel accepts a nominal 24 VDC input signal while operating across a wide wide-range tolerance of 3 to 36 VDC with a 10 mA per-channel current draw.
Field Installation Guidelines
- Ensure the I/O rack power supply is turned off before inserting or removing the module from the chassis slot.
- Align the module circuit board with the chassis slot guides and slide it in firmly until the backplane connector fully seats.
- Wire field contact inputs to the corresponding terminal block terminals using shielded twisted-pair conductors.
- Connect all field wiring cable shields directly to the cabinet functional ground (FE) busbar to prevent electromagnetic interference.
- Tighten terminal connection screws to recommended torque limits and verify that operating voltages remain within the 3 to 36 VDC range.
Honeywell 51402755-100 51304848-100 51305099-100 Input Module
Honeywell 51402755-100 51304848-100 51305099-100 Input Module
The Honeywell 51402755-100, also cataloged as the 51402755-100 Digital Input Module (associated with board numbers 51304848-100 and 51305099-100), operates as a dedicated hardware component for 24 VDC discrete signal acquisition within Honeywell DCS and process automation platforms. It directly monitors field switches, relay contacts, and proximity sensors across 16 channels while enforcing fail-safe state execution during power loss or communication interrupts.
Suffix Breakdown & Model Matrix
| Base Part Number | Associated Board / Sub-Assembly | Function / Hardware Level |
|---|---|---|
| 51402755-100 | 51304848-100 | Primary Digital Input Module Assembly |
| 51402755-100 | 51305099-100 | Sub-Assembly / Printed Circuit Board Component |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 51402755-100 (51304848-100 / 51305099-100) |
| Brand | Honeywell |
| Origin | United States |
| Weight | 0.5 lbs (0.23 kg) |
| Dimensions | 1.7 x 2.5 x 3.5 in (4.4 x 6.4 x 8.9 cm) |
| Operating Temp | Standard Industrial Operating Range |
| Power Consumption | Less than 100 mA |
| Number of Channels | 16 Digital Input Channels |
| Nominal Input Voltage | 24 VDC |
| Input Voltage Range | 3 to 36 VDC |
| Input Current | 10 mA per channel |
| Auxiliary Output | 24 VDC @ 100 mA |
Channel-to-Channel Isolation and HART Loop Integration
Designed for dense process control cabinets, the module features robust channel-to-channel isolation and galvanic signal filtering to prevent field noise, high-voltage transients, and ground loops from affecting backplane logic. The hardware maintains fail-safe state execution under fault conditions while seamlessly interfacing with Honeywell process networks. Integrated noise filtering and cold junction compensation (CJC) processing across adjacent I/O cards protect low-level signal paths and ensure deterministic data transmission alongside 4-20 mA HART loop protocol networks.
Frequently Asked Questions
Q: How does the fail-safe design of the 51402755-100 function during communication loss?
A: Upon detecting a backplane communication timeout or primary power loss, the input module forces channel state registers into a predetermined fail-safe default state to ensure predictable controller behavior and prevent false process trips.
Q: What input voltage thresholds are supported on the 16 channels?
A: Each channel accepts a nominal 24 VDC input signal while operating across a wide wide-range tolerance of 3 to 36 VDC with a 10 mA per-channel current draw.
Field Installation Guidelines
- Ensure the I/O rack power supply is turned off before inserting or removing the module from the chassis slot.
- Align the module circuit board with the chassis slot guides and slide it in firmly until the backplane connector fully seats.
- Wire field contact inputs to the corresponding terminal block terminals using shielded twisted-pair conductors.
- Connect all field wiring cable shields directly to the cabinet functional ground (FE) busbar to prevent electromagnetic interference.
- Tighten terminal connection screws to recommended torque limits and verify that operating voltages remain within the 3 to 36 VDC range.
