4 Safety Function Blocks
4 - 68
NX-series Safety Control Unit Instructions Reference Manual (Z931)
Error Detected
• The FB detects the absence of a mode selection as an error. This invalid state is detected after
ModeMonitorTime elapses.
• The invalid state restarts with each change to FALSE of an S_ModeX switched mode input,
and the state changes to ModeChanged (8005) after the FB is activated.
• If more than one mode input is selected at the same time, an error is detected immediately.
•If Reset is already TRUE when error state C001 or C002 is entered, the FB detects the unde-
tected change to TRUE as an error.
Operation for Errors
• When an error occurs, the S_ModeXSel and S_AnyModeSel outputs change to their safe states,
FALSE. The DiagCode output gives the relevant error code and the Error output changes to
TRUE.
• Errors are recognized when the Reset input changes to TRUE and the FB changes from an error
state to the ModeChanged state.
FB-specific Error Codes
Instruction Execution Errors
DiagCode (hexadecimal)
DiagCode
(decimal)
Status name Status description and output results
C001 49153 Error Short-circuit The FB detected that more than one S_ModeX input
is TRUE.
For example, the cable may be short-circuited.
Ready = TRUE
Error = TRUE
S_AnyModeSel = FALSE
All S_ModeXSel = FALSE
C002 49154 Error Open-circuit The FB detected that all S_ModeX inputs are
FALSE. The time after an S_ModeX input changed
exceeded ModeMonitorTime. For example, the
cable may be broken.
Ready = TRUE
Error = TRUE
S_AnyModeSel = FALSE
All S_ModeXSel = FALSE
C003 49155 Reset Error 1 When the Error Short-circuit state was entered, an
undetected change to TRUE in the Reset input was
detected.
Ready = TRUE
Error = TRUE
S_AnyModeSel = FALSE
All S_ModeXSel = FALSE
C004 49156 Reset Error 2 When the Error Open-circuit state was entered, an
undetected change to TRUE in the Reset input was
detected.
Ready = TRUE
Error = TRUE
S_AnyModeSel = FALSE
All S_ModeXSel = FALSE
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