Mitsubishi Electric MELSEC Q Series Programming Manual page 115

4 DEDICATED DEVICES
Device No.
Type
(Note-1)
SD42 Safety communication connection
SD43 information
Special
register
(Note-5)
SD980
PLC device allocation change
(Note-1): The ranges of SM0 to 127 and SD0 to 127 which are not on this list are also available. Refer to "Q173D(S)CPU/Q172D(S)CPU
Motion controller Programming Manual (COMMON)" for details.
(Note-2): Device number on PLC CPU side for the same function.
(Note-3): Command (Setting) device.
(Note-4): This device cannot be used in the user safety sequence program.
(Note-5): Refer to section 4.2 for details.
Name
Checks the connection status of safety communication
(Communicating: 1/Disconnected: 0), and stores the result
as bit data.
SD42: b0 to b15 (Axis 1 to 16)
SD43: b0 to b15 (Axis 17 to 32)
Changes device area used by sequence programs for safety
observation of PLC CPU.
0: fixed area
1: the end of usable area
4 - 2
Description
PLC side
(Note-2)
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