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Analog value representation

4.4 Effect on analog value representation

4.4.2

Effect of the value range on the 2AO I ST analog output

The way electronic modules respond to analog outputs depends on where the output values

fall within the value range. This is illustrated by the table below.

Table 4-6

Response of the analog modules, depending on where the analog output value falls within the range of values

Output value falls in ...

Nominal range

Over-/underrange

Overflow

Underflow

Prior to parameter assignment, or incorrect parameter

assignment*

* With product version 1 of the 2AO I ST, the following applies: If the configured substitute value is outside the nominal

range, a diagnostic message for a parameter assignment error is registered and the SF LED lights up. In this status the

output values transferred from the DP master are output at the analog output modules.

Output value in SIMATIC S5/S7 format

Value from DP master

0-signal

2AO I ST analog electronic module (6ES7135-4GB01-0AB0)

Manual, 04/2007, A5E01076949-01