R02/92
Matching Module 1 for Absolute Encoders
4.1
Function Description
The actual values arriving in Excess–3 Gray code are converted to TTL level by signal condition-
ing. A code converter then changes them to BCD code. These actual values are constantly trans-
ferred to the output memory and made available to the basic module.
While the actual values are being read, the memory cannot accept new actual values from the
encoder.
Encoders for Excess–3 Gray code with up to 5 decades (O – 99999) can be connected.
For Philips glass scales, the system can be switched over to half–step increments (0.5) since the
least significant digit with this encoder is not presented as a complete decade but as a binary sig-
nal.
If the encoder produces a change–of–value signal, the latter can be evaluated. The
change–of–
value signal starts the transfer of actual encoder values to the output memory.
The absolute encoder matching module 1 processes the 3–Excess–Gray code in accordance
with the table in section 4.3.5, The connections of the respective sub D connector are assigned to
this table.
If the encoder provides a different code table, the connections in the sub D connector must be
assigned accordingly (see example in section 4.3.6).
IP
241 Equipment Manual
@
Siemens AG 1989, Order No.: 6ES5
998-0KD21
4–1
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