Description of Functions
9-28
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
MDI block on-the-fly
The MDI block currently being processed is canceled when the user program out-
puts an “MDI block on-the-fly” (user DB, DBX38.4).
Transfer of “MDI block on-the-fly” interrupts the active “MDI block”. The new block
is executed immediately without “Start”.
The MDI block on-the-fly is not saved in the FM 353.
With software version 3.6 of the FM 353 and higher, the error ”Data cannot be
accepted at the time of transfer” (Class 4/No.1) is signaled when ”MDI block flying”
is provided and [BL] has already been reset or [PEH] =1.
Block structure
The following table shows the block structure of the MDI block.
X/t Position/dwell time programmed (fills in value 1)
G1 − G2 G function group 1 − 2
M1 − M3 M function group 1 − 3
F Speed programmed (fills in value 2)
Example
1)
Byte Data format
Bit
7 6 5 4 3 2 1 0
0 0 Byte 0
0 1 Byte 0
Bits 0, 1, 4 set 2 8 x bits 0 0 0 X/t 0 0 G2 G1
Bit 0 set 3 8 x bits 0 0 0 0 M3 M2 M1 F
90 4 Byte G function 1
30 5 Byte G function 2
0 6 Byte 0
0 7 Byte 0
100,000 8 DINT 32-Bit-value 1
5,000 12 DINT 32-Bit-value 2
0 16 Byte M function 1
0 17 Byte M function 2
0 18 Byte M function 3
0 19 Byte 0
1) Traversing block with absolute dimensions (G90), an end position of 100,000 DSG as
per MD7, and a speed of 5,000 DSG/min.
Note:
When the assignment bit (byte 2 and byte 3) is not set, the associated values must
be deleted.
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