Distributed I/O System ET 200S

Analog electronics modules
4.3 Basics of analog value processing
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 7FFFH.
• 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 (UCM) bridges must be wired at the
terminal module with the unused channels. This is required with the following modules:
2AI U Standard
Analog Input Module
2AI RTD Standard, 2AI RTD High
Feature, 2AI TC High Feature
2AI TC Standard
2AI U High Speed
TM connection terminal
Channel 0 Channel 1
1 2 3 4 5 6 7 8
ET 200S
4-24 Manual, 12/2005, A5E00514527-03