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Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 43

Safety programmable controller
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4
PRECAUTIONS FOR USE OF SAFETY
PROGRAMMABLE CONTROLLER
(a) Program example
(5) Detecting errors in CC-Link IE Field Network
Errors occurred in CC-Link IE Field Network can be detected using safety refresh
communication status shown in Table 4.5.
Create a program using safety refresh communication status, which turns off safety
outputs in case of an error.
(a) Safety refresh communication status
Table 4.5 Names and numbers of the special relay and special registers
Name
Safety refresh communication
status of safety master station
Safety refresh communication
status of each safety station
Figure 4.9 shows the program when the interlock for the safety remote I/O station
of station No. 1 on CC-Link Safety, connected to the first CC-Link Safety master
module is cleared.
SD1072.0
Reset switch
Safety station
interlock status
SD1072.0
SD1076.0
Safety station
Safety station interlock
interlock status
clear request
Figure 4.9 Program example to release interlock of CC-LInk Safety
Table 4.5 shows the special relay and special registers to check the status of
safety refresh communication between the own station and safety stations.
No.
0: Normal or safety communication with master station on CC-Link IE Field
SM1421
Network not set
1: Safety refresh communication error
Description of bits of the following table
0: Normal communication, reserved station, unused station, standard station
on CC-Link IE Field Network, or own station
1: Communication error of safety station on CC-Link IE Field Network
SD1420
SD1420 to
SD1421
SD1427
SD1422
SD1423
SD1424
SD1425
SD1426
SD1427
For details, refer to the following.
QSCPU User's Manual (Function Explanation, Program Fundamentals)
SET SD1076.0
Safety station interlock
clear request
RST SD1076.0
Safety station interlock
clear request
Description
b15
to
b8
16
to
9
32
to
25
48
to
41
64
to
57
80
to
73
96
to
89
112
to
105
-
to
-
1 to 120 in the table indicate station numbers.
-: Fixed to "0".
4.2 Precautions for Programming
b7
to
b0
8
to
1
24
to
17
40
to
33
56
to
49
72
to
65
88
to
81
104
to
97
120
to
113
4
- 13
1
2
3
4
5
6

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