Analog electronic modules
4.3 Basics of Analog Value Processing
ET 200S
Manual, Edition 10/2005, A5E00514527-01
4-23
4.3.3
Wiring unused channels of the analog input modules
Rules
Pay attention to the following instructions when wiring unused channels:
•
"Disable" unused input channels when setting parameters.
•
A disabled channel always returns the value 7FFF
H
.
•
The module cycle time is halved with the standard modules 2AI U, 2AI I 2WIRE,
2AI I 4WIRE, 2AI RTD Standard, 2AI RTD High Feature and 2AI TC Standard,
2AI TC High Feature.
•
The cycle time remains unchanged with the standard module 4AI I 2WIRE.
•
The cycle time remains unchanged at 1 ms with the HIGH SPEED modules 2AI U,
2AI I 2WIRE and 2AI I 4WIRE.
•
To maintain the allowable potential differences (U
CM
) bridges must be wired at the
terminal module with the unused channels. This is required with the following modules:
TM connection terminal
Channel 0
Channel 1
Analog Input Module
1
2
3
4
5
6
7
8
2AI U Standard
2AI RTD Standard, 2AI RTD High
Feature, 2AI TC High Feature
2AI TC Standard
2AI U High Speed
