Configuration of I/O Data Objects

To append I/O data, add the desired input / output objects to the Communication Module node.

Right-click the Communication Module node and select Add object.

Different types of data objects group I/O variables by size and direction. The I/O driver of the PLC firmware copies the amount of data bytes configured by these data objects cyclically. The time which is required for data copying is defined by the parameter Min. update time Parameterization of the CM582-DP/CM592-DP Communication Module.

Select the desired I/O objects from the list and click Add object.

Note

To keep basic load of PLC low, only configure as much I/O data objects as actually required. If further I/O variables need to be added later, additional data objects can be inserted.

Technical details on the device such as the maximum amount of bytes used for I/O data is described in the device specification for CM582-DP: CM582-DP - PROFIBUS DP Slave

Double-click an added I/O object node to open the preset configuration. As the I/O objects do not need user configuration all parameters in the Parameters tab are read-only.

Open the I/O Mapping tab to configure the mapping configuration for the I/O object.

Possible Inconsistency

On using CM582-DP slave device configured with modules types combining input and output data the following situation may happen:

Example

CM582-DP coupler device configuration uses module type 16 Byte In/Out.

The device representation assigned to CM592-DP master uses module types 16 Byte Output and 16 Byte Input at the same place instead.

This mismatch will not be detected; neither by Automation Builder nor by PROFIBUS master and slave.

However, the communication will run stable and I/O data exchange is executed successfully.

Reason:

AC500 defines modules combining input and output directions to be split to two separated module configurations internally with output direction first.

Thus in AC500 the PROFIBUS configuration data for one module of type 16 Byte In/Out looks the same as for the combination of module types 16 Byte Output and 16 Byte Input.