Memory Allocated To Fcs; Processing Times Of Fcs - Siemens SIMATIC S7-300 Manual

6.8 Technical specifications
Memory allocation
The following table gives you an overview of the memory allocated to FCs.
Table 6-9
1
2
3
4
5
6
Processing times The following average processing times for FCs were measured with a CPU
314. The specified times are rounded:
Table 6-10
INIT_DB
MODE_WR
RD_COM
DIAG_RD
MSRMENT
DIAG_INF
Note
In distributed configurations (under development) it is possible to increase
the number of cycles.
FM 354 Servo Drive Positioning Module

Memory allocated to FCs

No. FC
INIT_DB 224
MODE_WR 1226
RD_COM 774
DIAG_RD 302
MSRMENT 288
DIAG_INF 282

Processing times of FCs

FC Transfer
–
Write control/checkback sig-
nals without data (job = 0)
Write control/checkback sig-
nals with data (job > 1)
Read data
Read process and diagnostic
interrupt data
Programming the FM 354
Block in bytes MC7 code in
bytes
120
970
584
180
172
166
Cycle 1
–
1.3 ms
1.3 ms
3.0 ms
3.0 ms
Local data in
bytes
4
26
24
34
26
26
Cycle 2 Cycle 3
– –
– –
3.0 ms 1.3 ms
– –
– –
6-45