Safety Observation Function; Configuration Of Safety Observation Function - Mitsubishi Electric MELSEC Q Series Programming Manual

2 SAFETY OBSERVATION FUNCTION

2. SAFETY OBSERVATION FUNCTION
This chapter describes the safety observation function performed by safety observation
function compatible Motion CPU.

2.1 Configuration of Safety Observation Function

The safety observation function is structured by the following:
• Safety signal comparison which monitors the signal mismatch status with input/output
• Speed monitoring which monitors if the motor speed exceeds the safety speed or not.
• User safety sequence program which controls safety signal output.
• Safety communication with safety communication compatible servo amplifiers.
Motion CPU and PLC CPU execute the safety observation function.
(1) Safety signal comparison, Speed monitoring function
(2) User safety sequence program
signals on both CPUs side.
Motion CPU executes safety signal comparison and speed monitoring function
as internal processing. And, PLC CPU executes these functions in the sequence
program created automatically by Motion CPU. (Refer to Section 2.2 (1).)
The safety circuit is configured as a software program instead of hard-wired
safety relay logic.
Store the same logic program to each of the CPUs. The CPUs check the
processing of the program.
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