Programming FCs (Functions) and FBs for S7 Ethernet CPs

6.2Setting Parameters for FC Calls

Before describing the FCs in detail, a few general comments on calling and setting parameters for FCs will be useful in this point.

It is possible to make the following general statements about the following parameter groups that occur in all FCs:

SParameters for CP and connection assignment (input parameters)

SParameters for specifying a CPU data area (input parameters)

SStatus information (output parameters)

Calling Communication Blocks for an S7-300

Caution

The communication blocks for S7-300 (SIMATIC NET block libraries for S7-300 in STEP 7) must not be called in more than one priority class! If, for example, you call a communication block in OB1 and in OB35, block execution could be inter- rupted by the higher-priority OB.

If you call blocks in more than one OB, you must write your program so that a communication block that is currently executing cannot be interrupted by another communication block (for example by disabling/enabling SFC interrupts).

6.2.1Parameters for CP and Connection Assignment (input parameters)

When you call an FC, you transfer the module start address of the Ethernet CP in the CPLADDR or LADDR parameter. The module start address of the Ethernet CP can be found in the properties dialog of the CP in the ”Address/Input” tab (can be selected in the SIMATIC Manager or in HW Config).

With connection-oriented jobs, you must also reference the connection to be used by its connection ID. You will find this in the properties dialog of the connection under “Block parameters” (refer to the information in NetPro).

SIMATIC NET NCM S7 for Industrial Ethernet

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Siemens NCM S7 appendix Setting Parameters for FC Calls, Calling Communication Blocks for an S7-300

NCM S7 specifications

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