R02/92
Matching Module 2 for Absolute Encoders
5.1
Function Description
The arriving actual values
(BCD
or binary) are converted to
ITL
level by signal conditioning. These
values are transferred to the output memory and made available to the basic module.
This transfer is time delayed and only takes place at each change of the least significant data bit
(AO).
When the output memory of
pP
of the basic module is scanned, no transfer takes place.
In order to obtain short processing times, process the actual values and the setpoints in the same
format. See section 5.3.1.
Encoders with the following code types can be connected:
BCD
maximum representation range O – 99999
Dual (binary) maximum representation range O –
999991
Dual (binary) maximum representation range O – FFFFF
2
1
Switch
S1.1
open and
S1.2
closed (see section 5.3.1): the binary values are converted on the
basic module.
2
Switch
S1.1
and
S1.2
closed (see section 5.3.1): the binary values are processed further with-
out conversion.
An adjustable time delay insures the acquisition of all bits which have changed. This delay time
must be adapted to the maximum encoder frequency.
The delay time should be less than or equal to half the interval between two pulses at maximum
encoder frequency.
By increasing
C21
on the module, the delay can be increased.
State as delivered: 50 kHz = 10
psec
delay (i.e.,
C21
= 3.3
nF).
Example: --t maximum encoder frequency f = 1666 Hz
+
Interval l/f = 600
psec
--t half interval = 300
psec
-t
C21
= 30x 3.3
nF
= 100
nF
5–1
1P
241 Equipment Manual
@
siWfW3rIS
AG
1989, Order No.: 6ES5
998-0KD21
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