Checking The Connection Status Of Safety Communication - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION

2.9.5 Checking the connection status of safety communication

For a servo amplifier that supports the safety communication function, a safety
observation error does not occur when safety communication is disconnected. Check
that safety communication is connected with the safety communication connection
information special register (refer to Section 4.1), or the safety communication enabled
bit in the shared device for safety communication (refer to Section 4.3.6 (7)).
When incorporating the connection status as an interlock to the user safety sequence
program, use the safety communication enabled bit for the user safety sequence
program on the PLC CPU side. For the user safety sequence program on the Motion
CPU side, use the safety communication connection information.
(1) Safety communication connection information
Signal name
Safety communication
connection information
(2) Safety communication enabled bit
Device No.
Signal name
PLC CPU side
Safety

communication
enabled bit
(Note-1):
Device No.
Checks the connection status of safety communication
(Communicating: 1/Disconnected: 0), and stores the result as
SD42, SD43 bit data.
SD42: b0 to b15 (Axis 1 to 16)
SD43: b0 to b15 (Axis 17 to 32)
(Note-1)
Motion CPU
side
Shows the status of the safety communication function.
When safety communication is enabled, the bit of the
U3E1\G +76,
corresponding axis turns ON.
U3E1\G +77
U3E1\G +76: b0 to b15 (axis 1 to 16)
U3E1\G +77: b0 to b15 (axis 17 to 32)
is Multiple CPU shared device start address of safety communication parameter.
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