4 - 9
4 Safety Function Blocks
NX-series Safety Control Unit Instructions Reference Manual (Z931)
4
SF
_Antivalent
SF_Antivalent
This safety FB monitors the discrepancy time for two antivalent SAFEBOOL inputs.
Note “Antivalent” refers to the state where two inputs are simultaneously in the opposite status during normal
operation. This kind of inputs is also called complementary or non-equivalent.
Instruction
Name
FB/FUN
Graphic expression
SF_Antivalent
Antivalent
FB
Variables
Input Variables
Variable
Data type
Valid range
Default
Description
Activate
BOOL
TRUE or FALSE
FALSE
Refer to
Safety FB Common Input Variables
S_ChannelNC
SAFEBOOL TRUE or FALSE
FALSE
It functions as the input for a N.C. connection.
FALSE: The N.C. contacts are open.
TRUE: The N.C. contacts are closed.
* N.C. = Normally closed
S_ChannelNO
SAFEBOOL TRUE or FALSE
TRUE
It functions as the input for a N.O. connection.
FALSE: The N.O. contacts are open.
TRUE: The N.O. contacts are closed.
* N.O. = Normally open
Discrepancy-
Time
TIME
Depends on data
type.
T#0ms
It sets the maximum monitoring time for discrepancy
between two inputs.
Output Variables
Variable
Data type
Valid range
Default
Description
Ready
BOOL
TRUE or FALSE
FALSE
Safety FB Common Output Variables
S_AntivalentOut
SAFEBOOL TRUE or FALSE
FALSE
The safety output.
FALSE: At least one of the signals is FALSE or the state
changed outside the monitoring time.
TRUE: The two input signals are active and the state
changed within the monitoring time.
Error
BOOL
TRUE or FALSE
FALSE
Safety FB Common Output Variables
DiagCode
WORD
Depends on
state code.
16#0000
Safety FB Common Output Variables
SF_Antivalent
Activate
S_ChannelNC
S_ChannelNO
DiscrepancyTime
BOOL
SAFEBOOL
BOOL
WORD
Ready
S_AntivalentOut
Error
DiagCode
BOOL
SAFEBOOL
SAFEBOOL
TIME
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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