General limits
Description Limit Comments
Maximum number of all CFC charts considering all task
levels
32 When the limit is exceeded, an error indica-
tion is output by the device. Consequently,
the device starts monitoring. The red
ERROR-LED lights up.
Maximum number of all CFC charts considering one task
level
16 Only error message
(Evolving error in processing procedure)
Maximum number of all CFC inputs considering all charts 400 When the limit is exceeded, an error indica-
tion is output by the device. Consequently,
the device starts monitoring. The red
ERROR-LED lights up.
Maximum number of inputs of one chart for each task level
(number of unequal information items of the left border
per task level)
400 Only error message; here the number of
elements of the left border per task level is
counted. Since the same information is
indicated at the border several times, only
unequal information is to be counted.
Maximum number of reset-resistant flipflops
D_FF_MEMO, RS_FF_MEMO, SR_FF_MEMO
350 When the limit is exceeded, an error indica-
tion is output by the device. Consequently,
the device starts monitoring. The red
ERROR-LED lights up.
Device-specific Limits
Description
Limit Comments
Maximum number of concurrent changes to planned inputs
per task level
Chart inputs per task level
50 When the limit is exceeded, an error indica-
tion is output by the device. Consequently,
the device starts monitoring. The red
ERROR-LED lights up.
Maximum number of chart outputs per task level 150
Additional Limits
Additional Limits
1)
for the following CFC blocks
Task Level Maximum Number of Modules in the Task Levels
TIMER
2)
3)
TIMER_SHORT
2)
3)
MW_BEARB — —
PLC1_BEARB
15 30
PLC_BEARB
SFS_BEARB — —
1)
When the limit is exceeded, an error message is output by the device. Consequently, the device starts monitoring. The
red ERROR-LED lights up.
2)
For the maximum number of timers that can be used, the following constraint applies: (2 · number of TIMERs +
number of TIMER_SHORTs) < 30. TIMER and TIMER_SHORT thus share the available timer resources in the framework of
this inequality. The LONG_TIMER is not subject to this limit.
3)
The time values for the blocks TIMER and TIMER_SHORT must not be smaller than the time resolution of the device, i.e.
10 ms, otherwise the blocks will not start with the start pulse.
Maximum number of TICKS in the task levels
Task Level
Limit in TICKS
1)
MW_BEARB (Measured Value Processing) 10000
PLC1_BEARB (Slow PLC processing)) 2000
PLC_BEARB (Fast PLC Processing) 400
Technical Data
4.11 User-defined functions (CFC)
214 SIPROTEC 4, 7VE61 and 7VE63, Manual
C53000-G1176-C163-3, Edition 10.2017
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