Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Analogue output modules, electrically isolated
Input/output (I/O) modules
6-76
6
Typical output range (without component tolerances):
W605:
- 0.26 V…+ 10.36 V (instead of 0…+ 10 V)
W615:
- 0 mA…+ 21.4 mA (instead of 0…+ 20 mA)
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:
W605:
1 LSB = 10.38 µV
W615:
1 LSB = 21.7 µA
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.
In the FBs the output values are not limited to 0...1023, so the whole range of the
module can be used.
For voltages > 10 V or currents > 20 mA, values >1023 may be output, and for
voltages < 0 V or < -10 V, negative values may be output. (With the W615 it is not
possible to output negative currents).
This extended range does depend on the tolerances of the components, and cannot
be guaranteed.
Connection concept for voltage and current inputs
The voltage and current output signals are connected directly to the 14-pole terminal
block (O0 … O5 / O3 and -).
The following connection diagram shows a typical wiring layout for:
●
voltage outputs with the PCD2.W605 and .W625 modules or
●
current outputs for the PCD2.W615 module
Connection for 0..10 V (W605) or -10 V...+10 V
(W625):
D
A
5
U
R
≥
3 k
Ω
13
4
(A2)
No external supply is needed for voltage outputs.