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03.96
3.3 Connection of a 2nd MCP/customer OPI and/or 1 HHU (up to SW 3.1)
3-44
Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
The handheld unit (HHU) should be connected to the OPI so the user can bene-
fit from the following advantages:
S Easier start-up
S Reduction in communication tasks for PLC
If the HHU is operated on the MPI, it must be parameterized by means of the
STEP 7 “Communication Configuration” tool in addition to the parameter set-
tings in the basic PLC program. Data exchange between the PLC and HHU is
assisted by one of the four possible GD circuits in the PLC.
The following documents are also required:
References: /BH/ Operator Components Manual
/FB/, P3, Basic PLC Program
/S7HT/ Manual, Application of Tools
3.3.1 Connection to OPI bus
The following features are examples of deviations from the standard configura-
tion:
S Changing the address assignment of the input, output or status bytes for the
MCP in the PLC.
S Additional connection of a handheld unit (HHU) to the OPI.
S Connection of a 2nd MCP
You must adjust the communication parameters and possibly the switch settings
(addresses) of the bus nodes.
1. Call FB1, DB7 must be parameterized for all operator control components
(MCP, HHU) in OB 100 in the basic PLC program.
2. The status pointers (double word) for each operator control component must
be configured for each component in FB1 for monitoring purposes.
See example in Section 3.3.3.
Connection of
HHU
Documentation
requirements
Example
Procedure
3 Settin
s, MPI / OPI
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