Input Description

EN

Data_Type	Default_Value	Range	Unit
BOOL	FALSE	TRUE/FALSE	-

The input EN has to be driven in edge triggered mode.

The execution of the Function Block is started with a positive edge on the input EN.

In the first call it evaluates its inputs and creates a local copy of them. Afterwards it starts its internal algorithm. It may take several PLC task cycles until it is executed.

Once the execution is completed DONE and its other outputs are set. To start the Function Block again a new positive edge on the input EN has to be applied.

SLOT

Data_Type	Default_Value	Range	Unit
BYTE	0	0 … 4 (6)	-

At input SLOT, the Communication Module slot is specified which should be used by the Function Block.

The internal Communication Module always has the index 0. All external Communication Modules are serially numbered from right to left, starting with 1.

NUM

Data_Type	Default_Value	Range	Unit
BYTE	-	-	-

Input NUM is used to specify the number of valid telegrams to be transmitted and stored starting at address DATA.

When the Function Block is used with the Communication Module CM578-CN, the upper limit of input NUM depends on the total length of all telegrams. The total length is calculated by the Function Block from the data length codes (DLC) of the individual telegrams and must not exceed 254 bytes. Otherwise an error message is generated. In such cases, the number of telegrams to be transmitted has to be chosen correspondingly that the total length does not exceed 254.

When the Function Block is used with the Communication Module CM598-CN the upper limit of input NUM is 16.

DATA

Data_Type	Default_Value	Range	Unit
DWORD	-	-	-

The input DATA is used to provide the pointer to data structure of the object which is to be written.