Changing the Size of the Process Data

Exceeding the input data length (InputData)

By default, a maximum of 128 bytes of input data is set on the Bus Coupler.

The maximum lengths of the DP buffers can be changed, although the amount by which a length is increased has to be subtracted from another, and the sizes must only be modified in 8-byte steps:

Exceeding the output data length (OutputData)

By default, a maximum of 128 bytes of output data is set on the Bus Coupler.

The maximum length of the DP buffer can be changed. The amount, however, by which one length is increased must be taken away from another, and it must be noted that the sizes can only be changed in 8-byte steps:

Exceeding the configuration data length (CfgData)

By default, a maximum of 64 bytes of configuration data is set on the Bus Coupler. Normally, this is only a problem in very rare cases. In multi-configuration mode, however, this limit is reached with no more than a 30 digital terminals, because each KLxxxx MultiCfgMode module occupies two bytes in the configuration data, on top of which there is at least one sum byte for digital inputs or for digital outputs.

The maximum lengths of the DP buffers can be changed, although the amount by which a length is increased has to be subtracted from another, and the sizes must only be modified in 8-byte steps:

Maximum DP buffer sizes

Setting via the 2-BYTE PLC interface or KS2000

The maximum DP buffer sizes can be modified in Table 100, although it is necessary for the Bus Coupler to be reset (power off/power on, or a software reset) before the new value is adopted:

Setting via UserPrmData

The Bus Coupler's reset is carried out automatically if the DP buffers are set using UserPrmData:

Example 1: Not enough configuration data
 128 bytes input
 128 bytes output
 80 bytes CfgData
 48 bytes diagnosis data

Example 2: Not enough input data
 160 bytes input
 96 bytes output
 64 bytes CfgData
 64 bytes diagnosis data