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S5-95F
Error Response from Slave Node
The following steps are carried out if a node does not receive a valid frame within the stipulated
SINEC L1 safety time for Receive:
•
The operating system sets bit 0 in the "condition code and control byte Receive" and clears the
Receive mailbox
•
The operating system enters the error in the system event DB254's SINEC L1 error word
•
The operating system sets an error flag in the system event DB254's error buffer
•
The S5-95F branches to the error response programmed in DB1 (possible reactions to an error
are either a PLC STOP or a reaction invoked at the user level in the user program).
Problems with the SINEC L1 Bus Master
When problems occur with the SINEC L1 bus master, e.g. because it has gone to STOP or
because it is restarting following a POWER OFF-POWER ON sequence, they may cause a frame
delay. Should this happen, the SINEC L1 safety time could expire. In such a situation, the S5-95F
responds with STOP or with passivation of the data path, depending on the parameter values
specified in DB1.
In 95F message mode you can depassivate the passivated data path by setting bit 6 of the
"condition code and control byte for Receive" after taking steps to ensure safety.
In 115F-14 or 115F-15 message mode the operating system automatically depassivates the data
path on receipt of a valid frame.
EWA 4NEB 812 6210-02
S5-95F on SINEC L1
13-27
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