Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 21)

Publication 1785-UM012D-EN-P - July 2005
Understanding Your Programmable Controller 1-3
PLC-5/11, -5/20, and -5/26 Controller Front Panels
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
channel 1A communication port;
this 3-pin port is a dedicated DH+ port
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)
PLC-5 family member designation
Install memory module here.
Install battery here
channel 1B communication port;
its default configuration is remote
I/O scanner
channel 1B status indicator
(lights green and red)
keyswitch; selects controller mode
channel 1A communication port; for
the PLC-5/11 controller, the default
configuration is DH+
8-pin mini-DIN, DH+ programming
terminal connection parallel to
channel 1A
channel 1A 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
PLC-5/11 Controller
1
1
2
2
2
PLC-5/20 or -5/26 Controller