S5-115F Manual
Rules Governing the Use of the S5-115F
10.19.1
Polling List
The polling list must be such that every connection (source - destination) can be implemented at
least once.
Hinweis
You should make the appropriate number of entries in the polling list for source PLCs
transmitting to several nodes. You can increase the priority of the relevant data
transfers with multiple entries of the source PLC in the polling list. You must not,
however, enter the same source PLC in the polling list several times in immediate
succession.
10.19.2 SINEC L1 Safety Time
The SINEC L1 safety time depends on your automated process and on the control programs of the
communications partners involved. At the individual acceptance test, you must agree with the
inspector on a
uniform SINEC L1 safety time for all configured data paths.
The SINEC L1 safety time is configured by you when assigning communication parameters with
COM 115F. At the same time, COM 115F specifies the automatically calculated SINEC L1 polling
time. Ensure that the calculated SINEC L1 polling time is less than the agreed SINEC L1 safety time.
You can decrease the SINEC L1 safety time by reducing the volume of data to be transferred or by
reducing the number of configured data paths.
At least one valid message must be received over each configured data path within the SINEC L1
safety time. If any data path does not receive a valid message within the SINEC L1 safety time, the
operating system interprets this as a permanent error on the data transmission circuit and deletes
the relevant receive mailbox. The operating system also sets the source slave bit in block 1 of the
error DB.
If messages are received with errors as a result of brief fault causes (e.g. RF noise), repetition of the
messages is permissible before expiry of the SINEC L1 safety time. Message received with errors are
detected by the operating system and do
not change the contents of the receive mailbox
compared to the old status.
Repetition of messages is possible thanks to:
•
Multiple entry of the source PLC in the polling list
•
Reduction of the SINEC L1 polling time
Under error-free conditions, the response time is determined to a great extent by the SINEC L1
polling time. In the case of permanent faults, the safety response (deletion of the receive mailbox)
only takes place after an interval determined essentially by the SINEC L1 safety time.
EWA 4NEB 811 6148-02
10-69