Saia-Burgess Controls AG
Manual I/O-modules for PCD1 │ PCD2 series │ Document 27-600 – Release ENG09 │ 2019-05-01
5-89
I/O modules PCD1|PCD2
PCD2.W6x5
5
Terminals
Digital/analogue values
Output signals and type
Digital values
PCD2.W605
PCD2.W615
PCD2.W625
Classic xx7
Simatic
+ 10.0 V
+ 20 mA
+10 V
1023
1023
27684
+ 5.0 V
+ 10 mA
0 V
512
512
13842
+ 4 mA
205
205
5530
0 V
0 mA
–10 V
0
0
0
Notes on the output range
Balancing the offset and the amplification is done for the PCD2.W6x5 digitally by
the µC. As there is no potentiometer, the output range has been slightly enlarged
to cover maximum values even in the worst case.
Typical output range (without component tolerances):
PCD2.W605:
–
0.26 V … + 10.36 V (instead of 0 … + 10 V)
PCD2.W615:
0 mA … 21.4 mA (instead of 0 … 20 mA)
PCD2.W625:
–
10.62 V … 10.36 V (instead of
–
10 … +10 V)
This range is broken down on a 10 bit scale (1024 steps), as before. The result is
the following LSB resolution:
PCD2.W605:
1 LSB = 10.38 µV
PCD2.W615:
1 LSB = 21.7 µA
PCD2.W625:
1 LSB = 20.75 µV
With this balance the nominal range (0 … 10 V) is now scaled 0 … 1023, making it
possible for the output value not to change on an increase of 1 LSB.