Analog Channel Parameters

Overview

Parameters must be set for all of the analog channels before the module can be commissioned. This section provides the codes for setting the parameters and gives examples of parameter settings.

NOTE: If you set new parameters for the module, always send a complete set of parameters (all channels, inputs and outputs), even if you only want to change a single parameter. Otherwise the module will refuse the new parameters and continue working with the old ones.

Key

This section focuses on output word 1, as highlighted in the table below:

Word	Output Data
1 = LSW	Parameters for output channels 1 ... 4
2	Value, output channel 1
3	Value, output channel 2
4	Value, output channel 3
5 = MSW	Value, output channel 4

Illustration

Parameters are set by entering a four-bit code in output word 1, as follows:

Parameter Codes

The value entered in this word defines the behaviour of the I/O module in case of loss of communication. Each 4-bit nibble in output word 1 must be configured with one of the following binary codes to define the channel parameters. Parameters must be set for all four channels before the module can be commissioned.

In each case, the x may be a 0 or a 1:

Code	Output Parameter)	Function
0000	Reserved value	Forces the I/O base into a default condition where it continues to receive field inputs according to the previous received-channel parameters.
00x1	Output to Zero	Sends a value to the base that causes it to apply zero at the field output.
01x1	Full Range	Sends a value to the base that causes it to apply full scale (+10 V or + 20 mA) at the field output.
10x1	Output Last Value	Sends a value to the base that causes it to apply the last received value at the field output.