4 Safety Function Blocks
4 - 108
NX-series Safety Control Unit Instructions Reference Manual (Z931)
• This FB sends a request to change to safe mode to an actuator that has a safe mode and monitors
the status.
• S_SafetyRequest
is used to send a request to change to safe mode to the actuator according to the
mode given by
S_OpMode.
• The actuator returns the results of attempting to change to safe mode to
S_Acknowledge
.
• The FB outputs
S_SafetyActive
if the actuator changes to safe mode within the monitoring time
(
MonitoringTime
) from when the safe mode request was made.
This FB is used as an interface between the safety-related system and an actuator. This means that the
actuator’s safety-related functions can be used in the application program. However, there are only two
binary signals (the request signal and acknowledge signal) that are used to control the safe state of the
actuator.
• This safety function is provided by the actuator. Therefore, the FB only starts a request, monitors the
request, and sets an output after confirming the safe state of the actuator. This output is given by the
S_SafetyActive
output.
• This FB does not define actuator-specific parameters. The parameters must be defined in the actua-
tor. The FB changes the actuator from operation mode to the safe state.
DiagCode
WORD
Depends on state
code.
16#0000
Refer to
Safety FB Common Output Variables
Function
Variable
Data type
Valid range
Default
Description
SF_SafetyRequest
Activate
S_OpMode
S_Acknowledge
BOOL
User program
Valve block
Acknowledgment
System level
SAFEBOOL
SAFEBOOL
BOOL
Ready
S_SafetyActive
S_SafetyRequest
Error
WORD
DiagCode
BOOL
SAFEBOOL
SAFEBOOL
TIME
MonitoringTime
BOOL
Reset
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 ...
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