This parameter defines the input channel scan cycle for analog modules.
The input scan cycle may be:
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Normal: Channels are sampled within the time period specified in the module's characteristics.
-
Fast: Only those inputs declared to be In Use are sampled. The scan cycle is therefore determined by the number of channels in use and by the time period allocated for scanning one channel.
Input channel registers are updated at the beginning of the task to which the module is assigned.
NOTE: The Normal / Fast and In Use cycle parameters cannot be edited in online mode if the project has been transferred to the PLC with the default values specified for these parameters (i.e. Normal cycle and All channels in use).
The following table provides step-by-step instructions allowing you to define the scan cycle assigned to an analog module's inputs.
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Step
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Action
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1
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Access the hardware configuration screen for the appropriate module.
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2
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For the group of input channels you wish to configure, check the appropriate box (Normal or Fast) for the Cycle field of the General Parameters area.
Result: The selected scan cycle will be assigned to the channels.
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3
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Validate the change by clicking Edit → Validate.
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