Introduction
The Allen Bradley 1771-ASB/E is a serial communication module for the PLC-5 family, designed to facilitate data exchange between PLC-5 processors and external devices via serial interfaces. From a system integration standpoint, this module allows engineers to connect PLC-5 systems to remote I/O, operator panels, or third-party instruments. Its design ensures deterministic, reliable communication while maintaining compatibility with legacy industrial networks, making it indispensable for multi-rack or distributed PLC architectures.
Technical Specifications
| Parameter |
Description |
| Model Number |
1771-ASB/E |
| Module Type |
Serial Communication Module |
| Compatible Platform |
Allen Bradley PLC-5 |
| Communication Interface |
RS-232 / RS-422 serial communication |
| Baud Rate |
Configurable 300–38,400 bps |
| Isolation |
Optical isolation between module electronics and backplane |
| Number of Channels |
1 serial port |
| Operating Temperature |
0°C to 60°C |
| Storage Temperature |
–40°C to +85°C |
| Dimensions (H × W × D) |
140 mm × 35 mm × 160 mm |
| Weight |
≈ 0.30 kg |
| Mounting |
Standard PLC-5 1771 chassis slot |
Applications
-
Connecting PLC-5 processors to remote devices using serial communication
-
Integration with legacy instrumentation, HMIs, and third-party automation equipment
-
Multi-rack PLC-5 systems requiring inter-rack serial communication
-
Process control systems with distributed I/O requiring remote data acquisition
-
Systems where Ethernet or modern fieldbus networks are unavailable
Advantages
-
Deterministic serial communication: Reliable timing ensures predictable system performance
-
Single-port simplicity: Easy configuration and minimal footprint for serial connectivity
-
Electrical isolation: Protects PLC backplane and I/O modules from network surges
-
Flexible integration: Compatible with RS-232 and RS-422 devices
-
Compact design: Efficient use of chassis space while maintaining robust performance
Technical FAQs
-
Which serial standards are supported?
– RS-232 and RS-422 for point-to-point or multi-drop configurations.
-
What is the maximum baud rate?
– Up to 38,400 bps, configurable depending on connected devices.
-
Is the module electrically isolated?
– Yes, optical isolation separates the serial electronics from the backplane.
-
How many serial channels does it provide?
– One serial port per module.
-
Can it communicate with other PLC-5 modules in the same chassis?
– Yes, fully compatible with PLC-5 processors and I/O.
-
Is it hot-swappable?
– No, power must be off before insertion or removal.
-
What operating temperature range does it support?
– 0°C to 60°C.
-
What is the module’s weight?
– Approximately 0.30 kg.
-
Can it interface with HMIs or SCADA systems?
– Yes, via standard serial protocols.
-
Is it suitable for multi-rack PLC-5 installations?
– Yes, commonly used in distributed PLC-5 systems for inter-rack communication.
Recommended Related Models
| Model Number |
Description |
| 1771-XYC |
PLC-5 communication module for Data Highway Plus networks |
| 1771-KFSC |
Data Highway Plus interface card |
| 1771-XYB |
Alternative PLC-5 communication module |
| 1771-KF |
Serial communication interface module for PLC-5 |
Popular Allen Bradley Models
| Model Number |
Description |
| 1771-ASB/E |
Serial communication module |
| 1771-IR/D |
16-channel DC input module |
| 1771-OAN |
8-point AC output module |
| 1771-IA |
AC input module |
| 1771-OBD |
DC output module |
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