Rules Governing the Use of the S5-115F
S5-115F Manual
Insert this sequence of operations at the following points in your program:
•
At the beginning of every program block (OB, PB, SB and loadable FBs)
•
After a BLD 255 segmentation operation.
You must insert these segmentation operations in your program at intervals of not more than
approximately 128 operations. If you have programmed several BLD 255 operations within
128 operations, the sequence of operations for incrementing the LPLZ will be executed only after
the last BLD 255 (execution time!).
Note
Flag word FW 0 is reserved for the LPLZ, and must not be used for any other purpose.
10.3
Response Times
The user must be able to demonstrate specific response times when planning the automation of a
process requiring an authorization permit. Response time is defined here as the time that elapses
between a change in an input signal on the CPU side and the output response on the CPU side.
The response time is dependent on the procedure used:
•
Cyclic reading in and output
•
Direct access in the user program
•
Direct access in OB 13 (time interrupt OB)
•
Direct access in OB 2 (process interrupt OB)
•
Networking via the SINEC L1 LAN
In addition, the response times of the I/O modules, sensors and actuators must be taken into
account (inherent module delay).
The following is a demonstration of the calculation of worst-case response times, which the user
can regard as safety times. The following abbreviations are used.
•
T
PC
cycle
= PLC cycle time (execution time for user program and operating system program)
•
T
proc.
= Processing time between two operations
•
T
OB 13
= Time interrupt interval
•
T
synchr.
= Interval between two FB 254 SYNC calls
•
T
OS
= Response time of the OS to process interrupts
•
T
SINEC
poll
= SINEC L1 polling time
•
T
SINEC
safety
= SINEC L1 safety time
•
Additional footnotes:
R = Receiver
S = Sender
10-2
EWA 4NEB 811 6148-02
