User Manual PLC-3 FAMILY I/0 Instruction Manual

Scanner Hardware and Installation
Chapter 1
1-8
Not all DH+ stations are capable of operating above 57.6 kbps. You must
reference the appropriate users manual for the maximum communication
rate for each device.
ATTENTION: Channel 4 may not be configured for DH or
DH+ when operating any of the other communication channels
at 230.4 kbps. Otherwise, I/O rack retries and missing inputs in
a listen only mode backup system may result.
Figure 1.5
Setting
the Protocol, Communication Rate, and Station Address for
Channel Four
Protocol
Switch
43
DH
DH+
I/O scan
Configurable
through LIST
downdown
down
up
up
up
down
up
Communication
Switch
21
Rate (bps)
57.6k downdown
115.2k downup
1234
230.4k down up
Up (away from board)
Down (toward board)
If you set the protocol switches for DH or DH+ communication, you must
set the station number (Figure 1.6). Valid station numbers range from 000
to 376 octal for DH and 00 to 77 octal for DH+.
Switch numbers: correspond to the:
7 and 8 first digit (MSD)
1
4, 5 and 6 second digit
1, 2 and 3 third digit (LSD)
2
1
MSD = Most Significant Digit
2
LSD = Least Significant Digit