Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 66

5
SAFETY APPLICATION CONFIGURATION EXAMPLE (USING A
SINGLE SAFETY PROGRAMMABLE CONTROLLER)
(8) Timing chart
When the reset switch is
activated, the F+ESTOP
safety output (M1) is turned
on, enabling the F+EDM.
Reset switch (X140)
F+ESTOP safety output (M1)
Start switch (X142)
F+EDM reset input (M3)
Interlocked status (SD1272.0)
Interlock released status (SD1276.0)
CC-Link status (SD1204.0)
Emergency stop switch (X204)
Safety relay output (Y202)
Safety relay output check (X202)
F+EDM Error output (M2)
5
5.6 Case Examples
- 17
5.6.1 Emergency stop circuit
Emergency
stop switch
activated
Reset Start
switch switch switch
activated activated activated
When the emergency
stop switch is activated,
the F+ESTOP safety
output (M1) is turned
off, disabling the
F+EDM.
When the start switch is
activated, the F+EDM safety
output is turned on and the
safety relay output (Y202)
turns on.
Figure 5.13 Timing chart
Safety relay contact welding detection in this example (The same applies to other
examples in this manual.)
F+EDM is a safety FB that checks the contact welding of safety relays or safety
contactors connected to the safety outputs of the safety remote I/O station on CC-Link
Safety. The safety remote I/O station on CC-Link Safety has the doubling input
discrepancy detection function. Therefore, when either contact of a safety relay or a
safety contactor is welded, an error is detected both by the safety remote I/O station
on CC-Link Safety and by F+EDM.
If either auxiliary relay (normally closed contact) is welded when S_EDM_Out (output
of F+EDM) turns on, F+EDM does not detect the error while the safety remote I/O
station on CC-Link Safety does.
Accordingly, the program is created using the safety station refresh communication
status (SD1004 to SD1007 and SD1204 to SD1207) of the safety remote I/O station
on CC-Link Safety to which the auxiliary relay (normally closed contact) is connected
so that Activate may turn off to turn off the safety output of F+EDM.
(For SD1004 to SD1007 and SD1204 to SD1207, refer to Section 4.2 (3) Detecting
errors in CC-Link Safety.)
CC
remote (4)
error
Reset Start Reset
switch switch
activated activated
When an error occurs on the safety remote
I/O station on CC-Link Safety, inputs and
outputs of the corresponding station are
turned off. Also, the F+ESTOP and F+EDM
are disabled.
Emergency Contact welding
stop switch detected in the
activated safety relay 4
Reset Start
switch switch
activated activated
The safety remote I/O
station on CC-Link
Safety detects doubling
input discrepancy.