Siemens siprotec 7SA522 User Manual page 136

Configuration
Events
Consistency check
5-38
Connector
Figure 5-34 Connector
Events (SP_Ev, DP_Ev) are not suitable for processing in CFC, and should therefore
not be used as input signals.
In addition to the sample configuration chart 1, other configuration sheets may exist.
The contents of any particular configuration sheet is compiled by DIGSI
gram and processed by the protective device. For CFC charts developed by the user,
syntactic correctness can be verified by clicking the menu command &KDUW, and then
&KHFN &RQVLVWHQF\. The consistency check will determine if the modules violate
conventions of various task levels, or any of the space limitations described below.
Check of functional correctness must be performed manually.
The completed CFC chart can be saved via menu item &KDUW, and &ORVH. Likewise,
the CFC chart may be reopened and edited by clicking on &KDUW, selecting the appro-
priate chart, and clicking on 2SHQ.
Please note that certain limits and restrictions exist due to the available memory and
processing time required. For each of the four PLC task levels there is only a finite
processing time available within the processor system. Each module, each input to a
module (whether connected or not), each link generated from the border columns de-
mands a specific amount of processing time. The sum total of the individual process-
ing times in a task level may not exceed the defined maximum processing time for this
level.
The processing time is measured in so called TICKS. In the 7SA522 the following
maximum TICKS are permitted in the various task levels:
Table 5-8 Maximum number of TICKS in the task levels of 7SA522
Run-Time Level
0:B%($5% (Measured value processing)
3/&B%($5% (Slow PLC processing)
3/&B%($5% (Fast PLC processing)
6)6B%($5%
Interlocking)
(
In the following table, the amount of TICKS required by the individual elements of a
CFC chart is shown. A generic module refers to a module for which the number of in-
puts can be changed. Typical examples are the logic modules AND , NAND , OR , NOR .
®
4 into a pro-
Limits in TICKS
10000
1900
200
10000
7SA522 Manual
C53000-G1176-C119-2