Specifications

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Input Fields Description

AutoRefresh (Update

of GID project)

Use autorefresh and update the settings offline in the

corresponding GID project or the selected autorefresh

settings file (usually named 'iparam.wpa')

For transferring the slave I/O data, there is a choice of two different methods:

Slave Specific Transfer

: each input and output area of a slave can be mapped to a separate

device address. This type should not be used in combination with the I/O mapping POU because

it increases the time for data exchange between PROFIBUS master and PLC CPU. It is mainly

provided for compatibility with previous versions in combination with autorefresh and for use with

FX master modules. The device addresses are assigned in the I/O mapping dialog.

Block Transfer

: the complete inputs and outputs of all slaves are transferred to and from a single

device area in the CPU. This requires a larger contiguous memory area in the CPU, but saves

transfer time and autorefresh entries, if used in combination with autorefresh. It is the preferred

mode for use with I/O mapping. The device addresses for the input and output buffer must be set.

Note:

When using ‘Slave Specific’ transfer in combination with autorefresh, the total maximum

of 256 autorefresh entries per PLC CPU may be exceeded, when a large number of

slaves is used. Each input and each output area of a slave requires a separate

autorefresh entry.

Additionally to the I/O data the buffers containing diagnostic and status information can be

mapped to a device area in the CPU. For information on the contents of these buffers please

consult the manual of the respective master module.

The data is transferred between module buffer memory and CPU devices using TO/FROM

instructions, which are included in the PLC program code exported by GXDP. For Q-series PLCs

there is the additional option of autorefresh transfer. Autorefresh is supported for both slave

specific as well as block transfer mode. The advantages of the use of autorefresh are the faster

data exchange, data consistency and that there is no influence on the PLC cycle time. It is

configured via a parameter file on the PLC CPU.

Copy Instructions

The output transfer buffer at the user specified device address is copied to the buffer memory with

one (for ‘Block Transfer’) or several (for ‘Slave Specific’) TO instructions. In the opposite direction

the inputs are transferred with one or more FROM instructions from the buffer memory to the input

buffer device specified by the user. With the exception of the 'Copy POU' for the FX master 'Block

Transfer’ should be used in combination with TO/FROM instructions.

AutoRefresh (Update of CPU)

Note:

Available for Q-series only !

If selected, the autorefresh settings are updated online in the CPU after downloading the

configuration to the master module. The CPU must be stopped during the autorefresh update.

AutoRefresh (Update of GID Project)

Note:

Available for Q-series only !

If selected, the autorefresh settings are either updated in the autorefresh parameter file in the

corresponding GID project, or, if no GID project has been assigned, in the file specified by the

user.