Function Description - Siemens SIMATIC S5 Equipment Manual

Function Description

7.1
The serial actual values of an encoder with synchronous–serial interface according to RS 485 or
RS 422 are converted to ~arallel information on the encoder matchina module and are transferred
to the output memory of-the basic module.
LOOP
IN +
LOOP
OUT +
LOOP OUT + = OUTPUT "+ " SEND CLOCK PULSE GROUP
LOOP IN + = INPUT "+" ACTUAL ENCODER VALUE
TB CLOCK PULSE GROUP (NUMBER OF CLOCK PULSES) parameterizable
TBP CLOCK PULSE GROUP INTERVAL (DEFINED BY HARDWARE)
MSB MOST SIGNIFICANT BIT
LEAST SIGNIFICANT BIT
KB
CONTROL BIT
The encoder matching module fetches the actual encoder values by cyclic emission of a clock
pulse group (TB) and transfers them to the basic module via the output memory.
A clock pulse group is a package of single pulses.
The number of clock pulses in a clock pulse group depends on the encoder resolution.
@SiemensA(31989, Order No,: 6ES5998-0KD21
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Time sequence of a read cycle
x
Matching Module 4 for Absolute Encoders
KS
Module
LOOP
O U T +
LOOP
7 – 1