Allen-Bradley 1771-IXE PLC-5 Thermocouple Input Module
Configured for high-resolution thermal and low-level millivolt signal conditioning in Allen-Bradley PLC-5 architectures, the Allen-Bradley 1771-IXE (1771-IXE Thermocouple/Millivolt Input Module) provides direct physical/electrical execution. The module accepts up to 8 floating differential input signals, processing thermocouple emf potentials and +/-100 mV DC signals. Internal analog-to-digital processing circuits convert microvolt-level inputs into binary values transmitted across the PLC-5 backplane via block transfer read/write operations. Individual channel isolation suppresses common-mode voltage offsets and prevents ground loop noise interference across active signal lines.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-IXE |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.45 kg (0.99 lbs) |
| Dimensions | Standard 1771 I/O chassis single-slot card |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 750 mA at 5 VDC (backplane current) |
| Inputs | 8 floating differential inputs |
| Input Signal Type | Thermocouple / Millivolt (+/-100 mV) |
| System Integration | PLC-5 platform via 1771 I/O chassis backplane |
| Data Interface | Block Transfer interface |
| Channel Isolation | Galvanically isolated inputs |
Backplane Bus Communication & Deterministic Networking
The 1771-IXE module communicates across the 1771 backplane bus using deterministic Block Transfer Read (BTR) and Block Transfer Write (BTW) instruction sequences. Dedicated onboard microprocessor logic buffers incoming floating differential thermocouple measurements and packages digitized temperature frames into multi-word data structures for rapid backplane transfer. Backplane bus timing logic ensures low-latency execution during block transfer transfers, preventing CPU scan time stalls while maintaining firmware flash compatibility across legacy PLC-5 processor racks.
Frequently Asked Questions
Q: How does the 1771-IXE module transfer multi-channel thermocouple readings to the PLC-5 processor?
A: Data transfer is handled via Block Transfer Read (BTR) and Block Transfer Write (BTW) ladder logic instructions, moving entire multi-word measurement buffers across the backplane in a single CPU scan cycle.
Q: What is the backplane current draw for the 1771-IXE module from the 5 VDC power supply?
A: The module draws 750 mA maximum backplane current from the 1771 I/O chassis 5 VDC power rail.
Q: What precautions should be taken regarding thermocouple cable shielding and grounding?
A: Thermocouple extensions or millivolt signal conductors must use individually shielded twisted pairs. The shield drain wire must be grounded at a single technical earth bar inside the cabinet to prevent capacitive noise coupling.
Field Installation Guidelines
- Power down the 1771 I/O chassis before inserting the 1771-IXE card into the designated backplane slot.
- Align the module circuit board with the chassis card guides and push firmly until the backplane edge connector fully seats.
- Fasten the top and bottom chassis latching arms to ensure rigid mechanical retention and continuous frame grounding.
- Wire thermocouple leads or +/-100 mV millivolt signal conductors to the corresponding terminals on the 1771 field wiring arm.
- Terminate all cable shield drain wires at a single technical ground bus bar within the enclosure to eliminate ground loop currents across isolated differential channels.
Allen-Bradley 1771-IXE PLC-5 Thermocouple Input Module
Allen-Bradley 1771-IXE PLC-5 Thermocouple Input Module
Configured for high-resolution thermal and low-level millivolt signal conditioning in Allen-Bradley PLC-5 architectures, the Allen-Bradley 1771-IXE (1771-IXE Thermocouple/Millivolt Input Module) provides direct physical/electrical execution. The module accepts up to 8 floating differential input signals, processing thermocouple emf potentials and +/-100 mV DC signals. Internal analog-to-digital processing circuits convert microvolt-level inputs into binary values transmitted across the PLC-5 backplane via block transfer read/write operations. Individual channel isolation suppresses common-mode voltage offsets and prevents ground loop noise interference across active signal lines.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-IXE |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.45 kg (0.99 lbs) |
| Dimensions | Standard 1771 I/O chassis single-slot card |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 750 mA at 5 VDC (backplane current) |
| Inputs | 8 floating differential inputs |
| Input Signal Type | Thermocouple / Millivolt (+/-100 mV) |
| System Integration | PLC-5 platform via 1771 I/O chassis backplane |
| Data Interface | Block Transfer interface |
| Channel Isolation | Galvanically isolated inputs |
Backplane Bus Communication & Deterministic Networking
The 1771-IXE module communicates across the 1771 backplane bus using deterministic Block Transfer Read (BTR) and Block Transfer Write (BTW) instruction sequences. Dedicated onboard microprocessor logic buffers incoming floating differential thermocouple measurements and packages digitized temperature frames into multi-word data structures for rapid backplane transfer. Backplane bus timing logic ensures low-latency execution during block transfer transfers, preventing CPU scan time stalls while maintaining firmware flash compatibility across legacy PLC-5 processor racks.
Frequently Asked Questions
Q: How does the 1771-IXE module transfer multi-channel thermocouple readings to the PLC-5 processor?
A: Data transfer is handled via Block Transfer Read (BTR) and Block Transfer Write (BTW) ladder logic instructions, moving entire multi-word measurement buffers across the backplane in a single CPU scan cycle.
Q: What is the backplane current draw for the 1771-IXE module from the 5 VDC power supply?
A: The module draws 750 mA maximum backplane current from the 1771 I/O chassis 5 VDC power rail.
Q: What precautions should be taken regarding thermocouple cable shielding and grounding?
A: Thermocouple extensions or millivolt signal conductors must use individually shielded twisted pairs. The shield drain wire must be grounded at a single technical earth bar inside the cabinet to prevent capacitive noise coupling.
Field Installation Guidelines
- Power down the 1771 I/O chassis before inserting the 1771-IXE card into the designated backplane slot.
- Align the module circuit board with the chassis card guides and push firmly until the backplane edge connector fully seats.
- Fasten the top and bottom chassis latching arms to ensure rigid mechanical retention and continuous frame grounding.
- Wire thermocouple leads or +/-100 mV millivolt signal conductors to the corresponding terminals on the 1771 field wiring arm.
- Terminate all cable shield drain wires at a single technical ground bus bar within the enclosure to eliminate ground loop currents across isolated differential channels.
