Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 24)

Publication 1785-UM012D-EN-P - July 2005
1-6 Understanding Your Programmable Controller
PLC-5/20E Controller Front Panel
PLC-5/20E
Programmable
Controller
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
Install battery here
PLC-5 family member designation
channel 1B communication port;
its default configuration is remote I/O scanner
channel 1B status indicator
(lights green and red)
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
EIA 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
keyswitch; selects controller mode
channel 1A communication port; its 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)
channel 2 communication port;
a 15-pin Ethernet port
channel 2, Ethernet transmit indicator
(green when the channel is communicating)
channel 1A status indicator
(lights green and red)
Channel 0 is optically-coupled (provides high electrical noise immunity) and can be used with most RS-422A
equipment as long as:
termination resistors are not used
the distance and transmission rate are reduced to comply with RS-423 requirements
Configure these 3-pin ports for:
remote I/O scanner
remote I/O adapter
DH+ communication
unused
Configure this 3-pin port for:
remote I/O adapter
DH+ communication
3
1
1
2
2
3
external transceiver fuse