Technical Specifications - Siemens SIMATIC FM 353 Manual

Programming the Technological Functions
6.9

Technical specifications

Memory allocation
The Table below provides an overview of the memory allocation for the blocks and
the user data block (AW-DB). All values are rounded.
Table 6-13
No.
0
1 POS_CTRL
2 POS_DIAG
3 POS_MSRM
4
Table 6-14
No.
0 POS_INIT
1 POS_CTRL
2 POS_DIAG
3 POS_MSRM
4
Processing times for the blocks taking the following example system
The specified times are rounded.
Structure: CPU 315-2DP, FM 353 in the simulation mode
User cycle time: approx. 5 ms
FM cycle: 2 ms
Table 6-15
Block
POS_CTRL _
6-66
Memory requirements for the blocks and user data block
Block Block in bytes
Loading buffer
POS_INIT 250
3,394
310
286
AW-DB 1,884
Memory mapping of the blocks and of the user data block AW-DB,
"FM353_354" library
Block Block in bytes
Loading buffer
250
4,966
310
380
AW-DB 2,012
Processing times for the blocks
Transfer
Write control/status signals without data
Write control/status signals with data
Read control/status signals with data
MC7 code in Local data in
bytes
142
2,964
186
176
516
MC7 code in bytes Local data in bytes
142
3,198
186
242
576
Cycle 1 Cycle 2
1.3 ms
1.5 ms 3.2 ms
3.6 ms
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
bytes
4
22
46
20
−
4
34
46
32
−
Cycle 3
− −
1.5 ms
− −