4 Safety Function Blocks
4 - 76
NX-series Safety Control Unit Instructions Reference Manual (Z931)
Error Detected
The FB detects the following errors.
• DiscTime11_12 or DiscTime21_22 is set to less than T#0s or more than T#4s.
• MaxMutingTime is set to less than T#0s or more than T#10min.
• The discrepancy time for a sensor pair (MutingSwitch11 and MutingSwitch12, or MutingSwitch21
and MutingSwitch22) exceeded the set value.
•Muting (S_MutingActive = TRUE) exceeded MaxMutingTime (maximum muting time).
• The muting sensors (MutingSwitch11, MutingSwitch12, MutingSwitch21, and MutingSwitch22)
operated in an incorrect order.
• A muting sequence started without being enabled by MutingEnable.
• A muting lamp failure was indicated (S_MutingLamp = FALSE).
• An undetected change to TRUE in the Reset input was detected in state 8001 or 8003.
Operation for Errors
• When an error occurs, the S_AOPD_Out and S_MutingActive outputs are set to FALSE. The
DiagCode output gives the relevant error code and the Error output is set to TRUE.
• Operation is not restarted until the error is reset and the operator acknowledges the safe state
with Reset.
FB-specific Error Codes
Timing Charts
Instruction Execution Errors
DiagCode (hexadecimal)
DiagCode
(decimal)
Status name Status description and output results
C001 49153 Reset Error 1 When the Init state was entered, an undetected
change to TRUE in the Reset input was detected.
Ready = TRUE
S_AOPD_Out = FALSE
S_MutingActive = FALSE
Error = TRUE
Activate
MutingEnable
S_AOPD_In
S_MutingActive
MutingSwitch11
MutingSwitch12
MutingSwitch21
MutingSwitch22
Error
S_AOPD_Out
DiagCode
8000
8000 / 8011
8012 8012 8012 8014 8021 8021 8021 8021 8000 8000