Siemens SIMATIC S7-300 Manual page 202

Description of Functions
MDI block on-the- The MDI block currently being processed is canceled when the user program
fly
outputs an "MDI block on–the–fly" (job no. 16).
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 354.
Block structure The following table shows the block structure of the MDI block.
X/t
G1...G2
M1...M3
F
Note:
When the assignment bit (byte 2 and byte 3) is not set, the associated values
must be deleted.
9-26
Position/dwell time programmed (fills in value 1)
G function group 1...2
M function group 1...3
Speed programmed (fills in value 2)
Byte Data format
0 Byte
1 Byte
2 8 bits
3 8 bits
4 Byte
5 Byte
6 Byte
7 Byte
8 DINT
12 DINT
16 Byte
17 Byte
18 Byte
19 Byte
Bit
7 6 5 4 3 2
0
0
0 0 0 X/t 0 0
0 0 0 0 M3 M2 M1
G function 1
G function 2
0
0
32-bit value 1
32-bit value 2
M function 1
M function 2
M function 3
0
FM 354 Servo Drive Positioning Module
1 0
G2 G1
F