Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 76

5
SAFETY APPLICATION CONFIGURATION EXAMPLE (USING A
SINGLE SAFETY PROGRAMMABLE CONTROLLER)
(8) Timing chart
When the reset switch is
activated, the F+GMON
safety output (M1) is turned
on, enabling the F+EDM.
Reset switch (X140)
F+GMON 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)
Stop switch (X144)
Safety switch (X100)
Safety relay output (Y202)
Safety relay output check (X202)
F+EDM Error output (M2)
5
5.6 Case Examples
- 27
5.6.2 Door monitor circuit
For details on the safety FBs, F+GMON, and F+EDM, refer to the following.
QSCPU Programming Manual (Safety FB)
In this example, the guard status (open or close) is monitored using one safety switch.
The input signals of the F+GMON (S_GuradSwitch1 and S_GuradSwitch2) are
connected to the same signal of the safety switch (X100 or X101).
In addition, the value for the input signal (Discrepancy Time) of the F+GMON is set to
0 so that an error occurs immediately after the doubling input discrepancy is detected
between S_GuradSwitch1 and S_GuradSwitch2.
(Since S_GuradSwitch1 and S_GuradSwitch2 are connected to the same signal, the
doubling input discrepancy actually does not occur.)
If two safety switches are used to monitor the guard status, connect the input signals
(S_GuradSwitch1 and S_GuradSwitch2) to two different signals of the two safety
switches. Set the desired allowable discrepancy time between S_GuradSwitch1 and
S_GuradSwitch2 to Discrepancy Time of the F+GMON using a constant (in
increments of 10ms).
(Example: To set five seconds, connect the constant, K500.)
Stop switch
Door opened
activated
Reset Start Reset Start
switch switch switch switch
activated activated activated activated
When the stop switch is
activated, the F+GMON
is disabled.
When the start switch is
activated, the F+EDM safety
output is turned on and the safety
relay output (Y202) turns on.
Figure 5.22 Timing Chart
CC
Door closed
remote (4)
error
Reset Start Reset
switch switch switch
activated activated 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+GMON
and F+EDM are disabled.
Contact welding
Stop switch
detected in the
activated
safety relay 4
Reset Start
switch switch
activated
The safety remote I/O
station on CC-Link
Safety detects doubling
input discrepancy.