Siemens SIMATIC FM 353, Manual

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Programming the Technological Functions
6-66
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
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 Memory requirements for the blocks and user data block
No. Block Block in bytes
Loading buffer
MC7 code in
bytes
Local data in
bytes
0 POS_INIT 250 142 4
1 POS_CTRL 3,394 2,964 22
2 POS_DIAG 310 186 46
3 POS_MSRM 286 176 20
4 AW-DB 1,884 516 −
Table 6-14 Memory mapping of the blocks and of the user data block AW-DB,
“FM353_354” library
No. Block Block in bytes
Loading buffer
MC7 code in bytes Local data in bytes
0 POS_INIT 250 142 4
1 POS_CTRL 4,966 3,198 34
2 POS_DIAG 310 186 46
3 POS_MSRM 380 242 32
4 AW-DB 2,012 576 −
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 Processing times for the blocks
Block Transfer Cycle 1 Cycle 2 Cycle 3
Write control/status signals without data 1.3 ms − −
POS_CTRL
Write control/status signals with data 1.5 ms 3.2 ms 1.5 ms
_
Read control/status signals with data 3.6 ms − −