Siemens SIMATIC S5 Equipment Manual page 187

Programming Instructions
9.6.3 Reading the Result Tracks
In order to evaluate the current track bit assignment, bytes O to 3 and byte 7 can be read at all
times.
Result track bits are set when an internal counter value is within a specified initial and end setpoint.
In case of incremental encoders, synchronization bits are set when a synchronization pulse is ac-
tive (via an external preliminary contact in connection with a zero mark and a count pulse) or syn-
chronized by the software.
Track identifiers
(result track bits)
= Sign
Syn. = Identifier, indicating whether synchronizing
took place
= Identifier of the channel where the interrupt
was trig ered
= Enable it for write and read absolute value
= Track parameterized with IR identifier bit
An SP bit scan is not necessary to read the result tracks.
interrupt bits indicate which channel has triggered an interrupt (group signal) when an initial or
end setpoint or a zero shift value, parameterized with an interrupt identifier, was exceeded.
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R 02/92
Bit 7 6 5 4 3 2
I
4 Absolute 10 1 Absolute 10 0
5 Absolute 10 z Absolute 10 Z
Vz
6 Absolute 10 4