Technical Data Of The Function Blocks - Siemens SIMATIC CP 340 User Manual

6.8

Technical data of the function blocks

Introduction
Listed below is the technical specifications relating to memory requirements, runtimes,
minimum number of CPU cycles, and system functions used.
Memory requirements
The table below lists the memory requirements of the CP 340 function blocks/functions.
Table 6- 8 Memory requirements of the function blocks/functions (in bytes)
Block Name
FB 2 P_RCV
FB 3 P_SEND
FB 4 P_PRINT
FB 12 P_RESET
FC 5 V24_STAT
FC 6 V24_SET
Minimum number of CPU cycles
The table below describes the minimum number of CPU cycles (FB/FC calls) required to
process a "minimum job" (14 bytes SEND, 13 bytes RECEIVE for the quantity of user data
transported per program cycle). This only applies in centralized operation.
Table 6- 9
RECEIVE
SEND
PRINT
V24_STAT
V24_SET
Before the CP 340 can process an activated job after the CPU has changed from STOP to
RUN mode, the CP-CPU startup mechanism of the P_SEND or P_PRINT function block
must have been completed. Any requests initiated in the meantime do not get lost. They are
transmitted once the start-up coordination with the CP 340 is finished.
Before the CP 340 can receive a frame in the user program after a change in the CPU mode
from STOP to RUN, the CP-CPU startup mechanism "RCV" must be completed.
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
Version
2.0
2.0
2.0
1.0
2.0
2.0
Minimum number of CPU cycles
Number of CPU cycles for processing ...
Termination without
error
≥3
≥ 3
≥ 3
1
2
Communication using function blocks
6.8 Technical data of the function blocks
Load memory Work memory
2264
1942
2094
1454
182
150
Termination with error
≥ 3
≥ 3
≥ 3
-
>> 2
Local data
1888 40
1590 40
1726 44
1170 30
108 2
84 2
RESET/RESTART
≥ 4
≥ 4
≥ 4
-
-
125