Key Features

The key features of the 171 CBU 98090 and 171 CBU 98091 processors 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 configurable RS232 / RS485 serial port

    • 1 Ethernet port

  • diagnostic web pages accessible via USB and Ethernet

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

Port and LED Locations

The processor communication ports and LEDs:

1 Ethernet 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 processors feature the following LED panel display:

The processor LEDs indicate 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

ETH 100

green

Ethernet port speed

  • ON: 100mbps

  • OFF: 10mbps

ETH STS

green

An Ethernet link is established, or an error is detected.

NOTE: If an error is detected, the LED flashes to indicate the nature of the detected error.

ETH LNK/ACT

green

The presence of communication activity on the Ethernet port
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.