Hardware Manual

Hardware Manual PCD 1 / PCD 2 Series│Document 26 / 737│Edition EN 15│2008-07-22

Saia-Burgess Controls AG

PCD2.W3x0

Input/output (I/O) modules

5

Digital/analogue values

Input signals and type Digital values

PCD2.W300/W340 PCD2.W310/W340 PCD2.W340/50/60 Classic xx7 Simatic

+ 10.0 V + 20 mA Calculate the appro-

priate values with the

formulae at the end

of this section

4095 4095 27684

+ 5.0 V + 10 mA 2047 2047 13824

0 V 0 mA 0 0 0

Connection concept for voltage and current inputs

The voltage and current input signals are connected directly to the 10-pole terminal

block (E0 ... E7). To minimize the amount of interference coupled into the module

via the transmission lines, connection should be made according to the principle

explained below.

The following connection diagram shows a typical wiring layout for:

● voltage inputs with the PCD2.W300 and ... W340 Modules or

● current inputs with the PCD2.W310 and ... W340 Modules

9 8

E6

7 6

E4

5 4

E1

3 2

E0

1 0

E7 E5 E3 E2

Earthing bar

max. 20cm

COM

Distributor *)

*) potential free

● The reference potentials of signal sources should be wired to a common GND

connection (“–” and “COM” terminals). To obtain optimum measurement results,

any connection to an earthing bar should be avoided

● If shielded cables are used, the shield should be continued to an external earthing

bar.