Siemens SM 338 - 2.1 Layout

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Product Information on the Reference Manual Programmable Logic Controllers S7-300 Module Data Release 3
A5E00409892-01
AWL Explanation
L PED 256 //
T MD 100 //
U M 100.7 //
= M 99.0 //
L PED 260 //
T MD 104 //
U M 104.7 //
= M 99.1 //
L PED 264 //
T MD 108 //
U M 108.7 //
= M 99.2 //
L MB99//
T PAB 256 //
Read encoder value in the address range for
encoder input 0
Store encoder value in marker double word
Acquire and store freeze status for later
acknowledgment
Read encoder value in the address range for
encoder input 1
Store encoder value in marker double word
Acquire and store freeze status for later
acknowledgment
Read encoder value in the address range for
encoder input 2
Store encoder value in marker double word
Acquire and store freeze status for later
acknowledgment
Load and acknowledge freeze condition
(SM 338: output address 256)
Afterwards you can further process the encoder values from the marker range
MD 100, MD 104 and MD 108. The encoder value is contained in bits 0 to 30 of
the marker double word.