Siemens SINUMERIK 840D sl Function Manual page 1057

Figure 2-16
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
Parameter settings are made via the
relevant parameters in FB1.
Status information (MCP1 and MCP2 see table Status information)
Available in
BHGStatRec
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.
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
840D: MPI connection for HHU
Bit No.
10
2.7 Structure and functions of the basic program
HHU
(parameterization via SDB210)
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)
Description
Receiver: Time-out
Detailed description
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