Honeywell S8-1YREXW Communication Module
The Honeywell S8-1YREXW, also cataloged as the S8-1YREXW Communication Module, operates as a dedicated hardware component for serial data translation and multi-node networking within Honeywell controller architectures. It establishes serial fieldbus interfaces between primary controllers, supervisory computers, and third-party automation systems, executing bidirectional polling and event-driven data packet exchange across serial links.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | S8-1YREXW |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.85 kg (Shipping Weight: 1.50 kg) |
| Dimensions | 145 mm x 100 mm x 45 mm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 24 VDC bus powered |
| Module Type | Communication Interface Module |
| Serial Protocols | RS-232, RS-422, RS-485 |
| Max Baud Rate | Up to 38,400 bps |
| Max Node Capacity | Up to 32 network nodes per module |
| Supported Field Networks | Modbus, BACnet, LON |
4-20 mA HART Loop Protocol Integration and Channel-to-Channel Isolation
The S8-1YREXW provides continuous serial protocol conversion while maintaining galvanic channel-to-channel isolation between serial communication lines and internal backplane logic. This prevents high-voltage common-mode spikes, ground loops, and electrical noise from interfering with system buses. While handling serial networks like Modbus and BACnet, the module coexists within control enclosures containing analog modules handling 4-20 mA HART loop protocol instruments and temperature sensors with cold junction compensation (CJC), preserving data link integrity without introducing high-frequency cross-talk into analog loops.
Frequently Asked Questions
Q: Does the S8-1YREXW support remote firmware updates over the network?
A: Yes. Firmware upgrades can be executed remotely over the host controller interface without removing the module from its backplane or DIN-rail mounting base.
Q: How many RS-485 devices can be connected to a single S8-1YREXW module port?
A: The onboard transceiver driver supports up to 32 standard unit load nodes on a single multi-drop serial bus segment without requiring external signal repeaters.
Field Installation Guidelines
- Disconnect all 24 VDC power sources feeding the mounting rack before seating the module to avoid transient electrical arcs.
- Mount the S8-1YREXW onto the standard DIN-rail channel or backplane connector until the locking tab snaps into position.
- Wire RS-232, RS-422, or RS-485 serial communication cables using shielded twisted-pair conductors.
- Terminate long RS-485 bus runs by placing a 120-ohm termination resistor across the differential signal lines at the physical end nodes.
- Connect the cable shield drain wire directly to the cabinet functional earth (FE) terminal rail to maximize noise immunity.
Honeywell S8-1YREXW Communication Module
Honeywell S8-1YREXW Communication Module
The Honeywell S8-1YREXW, also cataloged as the S8-1YREXW Communication Module, operates as a dedicated hardware component for serial data translation and multi-node networking within Honeywell controller architectures. It establishes serial fieldbus interfaces between primary controllers, supervisory computers, and third-party automation systems, executing bidirectional polling and event-driven data packet exchange across serial links.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | S8-1YREXW |
| Brand | Honeywell |
| Origin | USA |
| Weight | 0.85 kg (Shipping Weight: 1.50 kg) |
| Dimensions | 145 mm x 100 mm x 45 mm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 24 VDC bus powered |
| Module Type | Communication Interface Module |
| Serial Protocols | RS-232, RS-422, RS-485 |
| Max Baud Rate | Up to 38,400 bps |
| Max Node Capacity | Up to 32 network nodes per module |
| Supported Field Networks | Modbus, BACnet, LON |
4-20 mA HART Loop Protocol Integration and Channel-to-Channel Isolation
The S8-1YREXW provides continuous serial protocol conversion while maintaining galvanic channel-to-channel isolation between serial communication lines and internal backplane logic. This prevents high-voltage common-mode spikes, ground loops, and electrical noise from interfering with system buses. While handling serial networks like Modbus and BACnet, the module coexists within control enclosures containing analog modules handling 4-20 mA HART loop protocol instruments and temperature sensors with cold junction compensation (CJC), preserving data link integrity without introducing high-frequency cross-talk into analog loops.
Frequently Asked Questions
Q: Does the S8-1YREXW support remote firmware updates over the network?
A: Yes. Firmware upgrades can be executed remotely over the host controller interface without removing the module from its backplane or DIN-rail mounting base.
Q: How many RS-485 devices can be connected to a single S8-1YREXW module port?
A: The onboard transceiver driver supports up to 32 standard unit load nodes on a single multi-drop serial bus segment without requiring external signal repeaters.
Field Installation Guidelines
- Disconnect all 24 VDC power sources feeding the mounting rack before seating the module to avoid transient electrical arcs.
- Mount the S8-1YREXW onto the standard DIN-rail channel or backplane connector until the locking tab snaps into position.
- Wire RS-232, RS-422, or RS-485 serial communication cables using shielded twisted-pair conductors.
- Terminate long RS-485 bus runs by placing a 120-ohm termination resistor across the differential signal lines at the physical end nodes.
- Connect the cable shield drain wire directly to the cabinet functional earth (FE) terminal rail to maximize noise immunity.
