![background image](http://html1.mh-extra.com/html/omron/nx-sl-series/nx-sl-series_instruction-and-reference-manual_742411222.webp)
4 Safety Function Blocks
4 - 92
NX-series Safety Control Unit Instructions Reference Manual (Z931)
Precautions for Correct Use
This FB does not detect short-circuits in muting sensor signals or errors in the function applica-
tions that supply those signals. It interprets them as illegal muting sequences. Unintentional
muting must not be allowed under these conditions. Give attention to this during risk assess-
ment.
• Muting is used to intentionally disable a safety function. Muting is used, for example, to pass a work-
piece through a hazardous area without stopping the machine. Muting is activated by muting sen-
sors. Two or four muting sensors are used. To correctly incorporate the safety function into a
manufacturing process, you must ensure that people will not enter the hazardous area while the light
curtain is being muted. Proximity sensors, photoelectric barriers, limit switches, and other devices
that do not have failsafe mechanisms are used for muting sensors. Muting operation must be indi-
cated by indicator lights.
• There are two types of muting: parallel and sequential. This FB performs sequential muting with four
muting sensors. Passing into a hazardous area in the forward direction is described below. (Refer to
SF_MutingSeq Instruction Application Example for Forward Entry with Four Sensors
The FB can be used for either forward or backward passage. To prevent manual operation, muting
must also be enabled by process control with the
MutingEnable
signal to perform muting. If the
MutingEnable
signal is inactive, it must be set to TRUE.
MutingEnable
BOOL
TRUE or FALSE
FALSE
A constant or a variable. It is a command from the control
system to enable starting muting as required in the
machine cycle. You can change this signal to OFF after
muting starts.
FALSE: Disables muting.
TRUE: Enables starting muting.
S_StartReset
SAFEBOOL TRUE or FALSE
FALSE
Refer to
Safety FB Common Input Variables
Reset
BOOL
TRUE or FALSE
FALSE
Refer to
Safety FB Common Input Variables
*1. You must connect a SAFEBOOL variable (not a BOOL variable) depending on safety requirements.
Output Variables
Variable
Data type
Valid range
Default
Description
Ready
BOOL
TRUE or FALSE
FALSE
Refer to
Safety FB Common Output Variables
4-4.
S_AOPD_Out
SAFEBOOL TRUE or FALSE
FALSE
This safety-related output gives the status of the protec-
tion devices that is being muted.
FALSE: Something has entered the AOPD protected area
and muting is disabled.
TRUE: Nothing has entered the AOPD protected area and
muting is enabled.
S_MutingActive
SAFEBOOL TRUE or FALSE
FALSE
Gives the muting status.
FALSE: Muting is disabled.
TRUE: Muting is enabled.
Error
BOOL
TRUE or FALSE
FALSE
Refer to
Safety FB Common Output Variables
4-4.
DiagCode
WORD
Depends on state
code.
16#0000
Refer to
Safety FB Common Output Variables
4-4.
Function
Variable
Data type
Valid range
Default
Description
Summary of Contents for NX-SL series
Page 8: ...CONTENTS 6 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 28: ...Sections in this Manual 26 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 98: ...2 Standard Functions 2 64 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 104: ...2 Standard Functions 2 70 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 110: ...2 Standard Functions 2 76 NX series Safety Control Unit Instructions Reference Manual Z931 ...
Page 265: ...I 1 I NX series Safety Control Unit Instructions Reference Manual Z931 Index ...
Page 268: ...I 4 NX series Safety Control Unit Instructions Reference Manual Z931 Index ...
Page 269: ......