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5 SAFETY APPLICATION CONFIGURATION EXAMPLES
5.1 System Configured by a Safety CPU
■Example of program using safety FBs
• Safety FBs to be used
For details on the safety FBs, refer to the following.
MELSEC iQ-R Safety Function Block Reference
In this example, the time difference (within 500ms) for two buttons to be turned on is checked. If the time difference does not
need to be checked, use M+SF_2HAND2_R, instead of M+SF_2HAND3_R.
Name Function Description
M+SF_2HAND3_R Two-hand switch Type This FB provides the two-hand control functionality (See ISO13851, Type . Fixed specified time difference
is 500ms).
M+SF_EDM_R External device monitor This FB controls a safety output and monitors controlled actuators, e.g. subsequent contactors.
(0) to (5) This is a circuit to release the interlock when a communication or I/O error occurs on the safety remote I/O station.
(8) This is a circuit to check the logic of the normally closed and normally open contacts of the two-hand operation switch 1.
(11) This is a circuit to check the logic of the normally closed and normally open contacts of the two-hand operation switch 2.
(14) This is a circuit to monitor the two-hand operation switch status.
(32) This is a circuit to monitor the contact welding in the electromagnetic contactors. Connect SA\SM400 (Always on) to the input signal,
i_bS_StartReset, of M+SF_EDM_R so that the safety output is turned on as soon as both operation switches 1 and 2 are pressed. Activate the
reset switch to clear an error occurred in the safety FB.
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