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13.4.3
Identification Data
13.5
Diagnostics with the Changeover Transducer Type
Brief Description
With the diagnostic functions for the changeover transducer type, the digital
electronics module checks the switchover between two input channels. If there is
no signal change after the specified switchover time (see technical specifications),
the module signals diagnostic information.
Purpose
You can use the diagnosis as follows:
• for diagnostic checking of the transducer
• to make certain that the switchover between NO contact and NC contact took
place
Principle
If the digital inputs of a channel group are set to "changeover", the module runs
diagnostics for the changeover transducer type for this channel group. The
tolerated switchover time between the two channels is set to the fixed value of 300
ms.
If the validation is negative,
• the module indicates the value status of the NO channel as "invalid",
• The module creates a diagnostic entry for the normally open contact channel.
• triggers a diagnostic interrupt.
The digital input signal and the value status are updated only for the NO channel
(channel 0, 2). For the NC channel (channel 1, 3), the digital input signal is set to
the fixed value "zero" and the value status is "invalid" since this channel is used
only for the validation of the sensor.
ET 200iS Distributed I/O Station
A5E00087831-02
Digital Electronics Modules
13-17
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