Fail-Safe Blocks
Fail-Safe Systems
8-26 A5E00085588-03
RETVAL Parameter
Return values (RET_VAL) of the system functions are indicated at the RETVAL
parameter of the blocks for F communication. The return values are error codes
that give you additional assistance in finding the error (see the section entitled
"Error Information at the Output RETVAL").
CRC_IMP Parameter
!
Safety Note – Do NOT change CRC_IMP input
Do not make any changes to the CRC_IMP I/O because this I/O is supplied
automatically. As a result of online changes to this I/O, errors can occur during
transmission of fail-safe data when the Safety Program is executed. For example,
data may be sent to the wrong recipient or may not be recognized as coming from
an incorrect sender.
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