Key Features

The key features of the 171 CBU 78090 processor include:

  • memory retention of application program and data without a battery

  • embedded real time clock: sustainable for 72 hours without external power, via a maintenance-free super capacitor

  • support for the following communication protocols:

    • Modbus Serial RS485

    • Modbus Serial RS232

  • I/O-Bus port with DB9 connector

  • 2 RJ45 connector ports:

    • 1 fixed RS485 2-wire port

    • 1 configurable RS232/RS485 2-wire port

  • diagnostic web pages accessible via USB

  • diagnostic LEDs for I/O, serial communication, and CPU status

Port and LED Locations

The processor communication ports and LEDs:

1 serial RS485 fixed port with RJ45 connector

2 serial RS232/485 configurable port with RJ45 connector

3 USB port with mini-B connector

4 I/O-Bus port with DB9 F connector

5 LED panel

LEDs

The processor features the following LED panel display:

Each LED on the panel indicates the following:

LED

Color

Indicates...

RUN

green

CPU operating status

ERR

red

Error detected in module operation

I/O

red

Error detected on the local base or remote I/O-Bus

MB1 CH0

yellow

Communication activity on the configurable RS232/RS485 serial port, channel 0

MB2 CH1

yellow

Communication activity on fixed RS485 serial port, channel 1
NOTE: Refer to the section LED Diagnostics for information describing how to use the LEDs to diagnose the state of the processor and I/O operations.