Detailed description
2.7 Structure and functions of the basic program
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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Figure 2-16 840D: MPI connection for HHU
Relevant parameters (FB1):
Communication between the PLC and HHU is implemented through configuring and
subsequent loading of SDB210 (Global Data). To allow the basic program to access the
HHU data and implement HHU failure monitoring, the addresses set via global data must be
declared in FB1 parameters.
Relevant parameters (FB1)
MCP HHU
(parameterization via SDB210)
Parameter settings are made via the
relevant parameters in FB1.
BHG = 1 (transfer via SDB210)
BHGIn (as parameterized in SDB210)
BHGOut (as parameterized in SDB210)
BHGStatRec (as parameterized in SDB210)
BHGTimeout (as parameterized in SDB210)
Status information (MCP1 and MCP2 see table Status information)
Available in Bit No. Description
BHGStatRec 10 Receiver: Time-out
An error entry is also made in the PLC diagnostic buffer for timeouts,
resulting in error message 400262 on the operator interface: HHU failure
An HHU failure is only recognized if data exchange has taken place previously with the HHU.
The first exchange of data with the HHU activates the monitoring function.
MPI connection
Communication starts from the PLC BP via the NCK and COM mode, i.e., even a link via the
MPI does not require an SDB210. Parameter settings are made via the relevant parameters
in FB1.
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