Mitsubishi Electric MELSEC iQ-R Series Safety Manual page 87

■Timing chart
When the reset switch is pressed,
the M+SF_ESTOP_R safety output
(SA\M1) is turned on, enabling the
M+SF_EDM_R.
Reset switch (reset_in)
M+SF_ESTOP_R safety output
(SA\M1)
Start switch (start_in)
M+SF_EDM_R reset input (SA\M3)
Interlock status (SA\SD1232.0)
Interlock release request
(SA\SD1240.0)
Safety refresh communication status
(SA\SD1008.0)
Emergency stop switch (SA\X0)
Safety relay output (SA\Y0)
Safety relay output check (SA\Y1)
M+SF_EDM_R Error output (SA\M2)
Safety relay contact welding detection in this example (The same applies to other examples in this manual.)
M+SF_EDM_R is a safety FB that checks contact welding of safety relays or safety contactors connected to safety outputs of
a safety remote station. A safety remote station has the double input discrepancy detection function. Therefore, when either of
a safety relay or a safety electromagnetic contactor is welded, an error is detected both by the safety remote station and
M+SF_EDM_R. If either normally closed contact of safety relay is welded when o_bS_EDM_Out (output of M+SF_EDM_R)
turns on, M+SF_EDM_R does not detect the error while the safety remote station does. Accordingly, the program is created
using SA\SD1008 (Safety refresh communication status of each safety connection) to which the normally closed contact of
safety relay is connected so that i_bActivate may turn off to turn off the safety output of M+SF_EDM_R.
For the safety special register areas for the safety refresh communication status of each safety connection, refer to the
following.
Page 42 Clearing error in the CC-Link IE Field Network
Emergency
stop switch
pressed
Reset Start Start Reset Start Start
switch switch switch switch switch switch
pressed pressed pressed pressed pressed pressed
When the emergency
stop switch is pressed,
the M+SF_ESTOP_R
safety output (SA\M1)
is turned off, disabling
the M+SF_EDM_R.
When the start switch is
pressed, the M+SF_EDM_R
safety output is turned on
and the safety relay output
(SA\Y0) turns on.
CCIEF Emergency
remote (1) stop switch
error pressed
Reset Reset
switch switch
pressed pressed
When an error occurs in a safety remote
I/O module, inputs and outputs of the safety
remote I/O module are turned off.
Also, the M+SF_ESTOP_R and
M+SF_EDM_R are disabled.
5 SAFETY APPLICATION CONFIGURATION EXAMPLES
5.1 System Configured by a Safety CPU
Contact welding
detected in the
safety relay
Start Start
switch switch
pressed pressed
A safety remote I/O
module detects a double
input discrepancy.
5
85