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APPENDICES
A
Appendix 4 Link Special Register (SW) List
SW0071
Loopback station
number 2
Stores the number of the station where loopback is being performed. The
other loopback station number can be checked by Loopback station
number 1 (SW0070).
0: No loopback stations
1 to 120: Slave station
125: Master station
255: Station number not set
If loopback occurs at a station whose station number is duplicated, the
station number is stored in this register.
(Condition)
• This is enabled when Baton pass status (own station) (SB0047) is off.
×
SW0074
PORT1 cable
disconnection detection
count
Stores the (cumulative) count that was detected for cable disconnections
at the PORT1.
When Clear communication error count (SB0006) is turned on, the
stored occurrence rate is cleared.
When FFFF
H
is counted, the value returns to 0 and the module
continues to count.
SW0075
PORT1 receive error
detection count
Stores the (cumulative) count that data was received at the PORT1.
The count stores only error data that is not transmitted to all stations.
When Clear communication error count (SB0006) is turned on, the
stored occurrence rate is cleared.
When FFFF
H
is counted, counting stops.
SW0076
PORT1 total no. of
received data (lower 1
word)
Stores the (cumulative) count that data was received at the PORT1.
When Clear communication error count (SB0006) is turned on, the
stored occurrence rate is cleared.
When FFFFFFFF
H
is counted, counting stops.
SW0077
PORT1 total no. of
received data (upper 1
word)
SW007A Event count
Stores the count of the network event history.
This stored count is cleared when Event count clear (SB0009) is turned
on.
When FFFF
H
is counted, counting stops.
SW007C
PORT2 cable
disconnection detection
count
Stores the (cumulative) count that was detected for cable disconnections
at the PORT2.
When Clear communication error count (SB0006) is turned on, the
stored occurrence rate is cleared.
When FFFF
H
is counted, the value returns to 0 and the module
continues to count.
SW007D
PORT2 receive error
detection count
Stores the (cumulative) count that error data was received at the PORT2.
The count stores only error data that is not transmitted to all stations.
When Clear communication error count (SB0006) is turned on, the
stored occurrence rate is cleared.
When FFFF
H
is counted, counting stops.
Number Name Description
Availability
Master
station
(safety
station)
Local
station