QUESTION:
What is the meaning of the error STATUS "0x7000" on function block FC5 / FC50 (AG_SEND) with Send/Receive communication on the S7-400 controller?

ANSWER:
Send/Receive communication on the S7-400 can be realized using the blocks FC5 / FC50 (AG_RECV) and FC6 / FC60 (AG_SEND). When the AG_SEND block is called, the "ERROR" parameter has the value "True" and the "STATUS" parameter the value "0x7000".

STATUS "0x7000" does not indicate an error on the block, but simply indicates that the AG_SEND block has been called with ACT=0 without a job being triggered beforehand with ACT=TRUE. A simple way of responding to this situation is illustrated below. The complete example of a Send/Receive communication is available in FAQ Entry ID 18513371.

Logical representation:

IF (ERROR = = 1 )
{
	IF (STATUS != 0x7000)
	{
	==> trigger error processing
	}
}

STL example:

e.g. ERROR = M0.2 STATUS = MW4
UN M0.2	// no error
SPB NOER
L MW4	// status
L W#16#7000
= = I	// if equal to 7000, then no error is present
SPB NOER	// no error
	// run error processing
BEA
NOER: SET