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4 Safety Function Blocks
NX-series Safety Control Unit Instructions Reference Manual (Z931)
4
SF
_Guar
dMonitoring
Error Detected
• Specific errors are detected for the SAFEBOOL external signal input. According to EN ISO
13849-1 (safety guards that have two switches), mechanical settings and open/close switch set-
tings are combined. According to EN ISO 13849-1, the offset in the response times of both
mechanical switches is monitored as the discrepancy time. The offset is treated as detection of an
application error, i.e., an error created by the application.
• An error is detected when the offset between the first input and second input for
S_GuardSwitch1
or
S_GuardSwitch2
is larger than the value of the
DiscrepancyTime
input. The
Error
output is set
to TRUE.
• If
Reset
is already TRUE when the Wait for Reset state is entered, this FB detects the undetected
change to TRUE as an error.
Reset Operation for Errors
• When an error occurs, the
S_GuardMonitoring
output is set to FALSE.
• If the two inputs
S_GuardSwitch1
and
S_GuardSwitch2
are bridged, an error is not detected. To
reset the Reset Error state, you must set the
Reset
input to FALSE.
• The
S_GuardSwitch1
and
S_GuardSwitch2
inputs must both be set to FALSE to reset a discrep-
ancy time error.
FB-specific Error Codes
FB-specific State Codes (No Error)
Instruction Execution Errors
DiagCode (hexadecimal)
DiagCode
(decimal)
Status name
Status description and output results
C001
49153
Reset Error
When the Wait for Reset state was entered, an
undetected change to TRUE in the
Reset
input
was detected.
Ready
= TRUE
S_GuardMonitoring
= FALSE
Error
= TRUE
C011
49169
Discrepancytime Error
1
The discrepancy time expired in state 8004.
Ready
= TRUE
S_GuardMonitoring
= FALSE
Error
= TRUE
C012
49170
Discrepancytime Error
2
The discrepancy time expired in state 8014.
Ready
= TRUE
S_GuardMonitoring
= FALSE
Error
= TRUE
DiagCode (hexadecimal)
DiagCode
(decimal)
Status name
Status description and output results
0000
0
Idle
The FB is disabled (default).
Ready
= FALSE
S_GuardMonitoring
= FALSE
Error
= FALSE
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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