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S5-95F
Contents of the Condition Code and Control Byte for Receive
(DR0 in 115F-14 Message Mode)
Condition Code Byte for Receive
7
6
5
4
3
EWA 4NEB 812 6210-02
2
1
0
0: Frame valid (operating system resets bit in the RESTART
routine and following depassivation via FB255)
1: Frame invalid. Safety time expired.
Depending on how DB1 was initialized, the system either
reacts with a PLC STOP or responds as programmed at the
user level. No other frames are transferred to the Receive
Mailbox as long as this bit is "1".
0: o.k.
1: Monitoring time for data transfer via subunit A expired. Fault
is tolerated on high-availability L1 bus. The operating system
resets this bit when a valid frame is received.
0: o.k.
1: Monitoring time for data transfer via subunit B expired. Fault
is tolerated on high-availability L1 bus. The operating system
resets this bit when a valid frame is received.
0: At least one valid frame received.
1: No valid frame received.
S5-95F on SINEC L1
13-23
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