GE Series 90-30 PLC

GFK-0356Q Chapter 7 Input/Output Modules 7-9
7
A
1
A
2
A
4
A
3
OK
ANALOG
CURRENT
OUTPUT
1
2
3
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
4
44A729182-021R01
FOR USE WITH
IC693ALG391
Lens Cap
Module OK LED
Removeable Terminal
Board
Module Catalog
No.
Module T
y
pe
Connection
Diagram
2
1
VOUT1
VOUT2
IOUT1
RTN1
RTN2
IOUT2
GND
GND
JMPV1
JMPV2
DEF0
0-20mA
*
*
CH1
*
+
-
24V
CH2
0-20mA
*
*OPT. CONN. SEE USER'S MANUAL
Removeable
Insert
Hin
g
ed Cover
Figure 7-5. Example of Series 90-30 Analog Current Output Module
Wiring Methods for Analog Modules
Twisted, shielded instrumentation cable is strongly recommended for analog module input or
output signal connections. Proper grounding of the shield is also important. For maximum
electrical noise suppression, the cable shield should only be grounded at one end of the cable. For
Input modules, ground the end that is in the noisiest environment (which often is at the field device
end). For Output modules, ground at the module end. See GFK-0898,
Series 90-30 PLC I/O
Module Specifications,
for more shield grounding information
.
Analog Input Module Wiring Methods
Correcting electrical noise problems can sometimes be a trial-and-error routine. However, in
general, it is generally best to ground the cable shield as close to the source of the noise as possible,
which is usually at the device end. In troubleshooting noise problems, sometimes it is beneficial to
experiment with the shield grounding point location. Remember, the cable shield should be
grounded at one end only. Also, it is best to keep the length of stripped cable leads as short as
possible to minimize the length of unshielded conductors that will be exposed to the noisy
environment. See the
Series 90-30 PLC I/O Module Specifications Manual,
GFK-0898 for
additional details.