Mitsubishi Electric MELSEC iQ-R Series Safety Function Block Reference page 63

■ Output labels
No. Variable name Data type
(11) o_bReady Bit
(12) o_bS_AOPD_Out Bit*
(13) o_bS_MutingActive Bit*
(14) o_bError Bit
(15) o_wDiagCode Word [signed]
WARNING
• Use safety data for connecting the variable whose data type is "Bit*" to input-output circuits.
• A safety program is executed as a fixed scan execution type program.
• A safety program is executed at a fixed cycle according to a set safety cycle time. The safety FB that monitors the time must meet the following requirements.
⋅ The timeout processing may be delayed by the safety cycle time by executing the safety program. Set the safety cycle time so the delay by the safety
cycle time does not pose a hazard.
⋅ If the program is executed exceeding the safety cycle processing time, the timeout may be delayed. Ensure that an abnormality does not occur during
operation.
FB details
Muting is the intended suppression of the safety function. This is required, e.g., when transporting a workpiece into the danger
zone without causing the machine to stop. Muting is triggered by muting sensors. The use of two muting sensors and correct
integration into the production sequence must ensure that no persons enter the danger zone while the light curtain is muted.
Muting sensors can be push buttons, proximity switches, photoelectric barriers, limit switches, etc. which do not have to be
failsafe. Active muting mode must be indicated by indicator lights (the muting lamp).
There are sequential and parallel muting procedures. In this FB, parallel muting with two muting sensors is used. The
positioning of the sensors must conform to IEC 62046 as shown in the figure. The FB can be used in both directions, forward
and backward. However, the actual direction cannot be identified. The muting should be enabled with the i_bMutingEnable
signal by the process control when there is no manipulation in the danger zone.
The FB input parameters include the signals of the two muting sensors (i_bS_MutingSw_11 and i_bS_MutingSw_12), the
OSSD signal (i_bS_AOPD_In) from the "active opto-electronic protective device", as well as two parameterizable times
(i_dDiscTimeEntry and i_dMaxMutingTime).
While both of the two muting sensors are on, muting is active and o_bS_AOPD_Out is set to ON, although i_bS_AOPD_In is
OFF.
■ Example for M+SF_MUTE2_R with two reflecting light barriers
Figure
Transmitter
MS_11
MS_12 Receiver
Default value Description
OFF Status of whether the safety FB is activated or not.
For details, see the following.
Page 11 General Functions
OFF Safety output, indicates status of the muted guard.
OFF: AOPD protection field interrupted and muting not active.
ON: AOPD protection field not interrupted or muting active.
OFF Indicates status of muting process.
OFF: Muting not active
ON: Muting active
OFF Error flag.
For details, see the following.
Page 11 General Functions
0 Diagnostic code.
For details, see the following.
Page 11 General Functions
Description
If reflection light barriers are used as muting sensors, they are generally
Danger Zone
arranged diagonally. In general, this arrangement of reflection light barriers as
muting sensors requires only two light barriers, and only i_bS_MutingSw_11
(MS_11) and i_bS_MutingSw_12 (MS_12) are allocated.
4 SAFETY FB SPECIFICATIONS
4.10 M+SF_MUTE2_R
4
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