About the controllers – Rockwell Automation 1785-Lx0E Ethernet PLC-5 Programmable Controllers Installation Instructions User Manual
Page 6
Publication 1785-IN063B-EN-P - January 2006
6 Ethernet PLC-5 Programmable Controllers
About the Controllers
The following illustrations indicate the controller’s front panel components.
PLC-5/20E, -5/40E and -5/80E, Controller Front Panel
Additional System Components
Along with your controller, you need the following components to complete a 
basic system.
43909
PLC-5/40E
Programmable
Controller
Use this port with ASCII or DF1 full-duplex, half-duplex 
master, and half-duplex slave protocols. The port's 
default configuration supports controller programming:
Channel 0-25-pin D-shell serial port. Supports standard 
CEIA RS-232C and RS-423 and is RS-422A compatible.
 One stop-bit
 BCC error check
 No handshaking
 DF1 point-to-point 
 2400 bps
 No parity
Battery Indicator (red when the battery is low)
Controller RUN/FAULT Indicator (green when 
running; red when faulted)
Force Indicator (amber when I/O forces 
are enabled)
Channel 0 Communication Status Indicator 
(green when the channel is communicating)
Install Memory Module Here
Use these labels to write information about the 
channel, such as communication mode and station addresses.
Install Battery Here
Channel 1B Status Indicator (lights green and red)
PLC-5 Family Member Designation
Keyswitch - Selects Controller Mode
Channel 1A Communication Port - Default 
Configuration Is DH+ Communication
8-pin Mini-DIN, DH+ Programming Terminal 
Connection Parallel to Channel 1A
Channel 2 Ethernet Status Indicator (green when 
functioning normally; red when not functioning)
Ethernet Channel 2 Communication
Port - RJ45 Connector
Channel 1A Status Indicator
(lights green and red)
Channel 2, Ethernet Transmit Indicators 
(green when the channel is communicating 
at either 100M or 10M communication rate)
Channel 1B Communication Port - Default 
Configuration Is Remote I/O Scanner
ETHERNET
STAT
100M
10M
Product
Cat. No.
Lithium battery
1770-XYC
I/O chassis
1771-A1B, -A2B, -A3B, -A3B1, -A4B
Power supply
1771-P4S, -P6S, -P4S1, -P6S1
Personal computer