5 MPI Communication
5.7 Handheld terminal HT 6
the NC interface
Example: Connecting an HT 6 to SINUMERIK 840Di
The FC 26 transfers the signals of the HT 6 with regard to:
to the NC through the PLC interface.
Block FC 26 or FC is part of the basic PLC program. It is the user's (machine
manufacturer's) responsibility to call the block correctly and/or assign the inter-
face the appropriate parameters.
For a detailed description of FC 26 and FC, please refer to:
Description of Functions, Basic Machine: P3, Basic PLC Program
Section: FC 26 HPU_MCP Transfer of HPU signals tointerface
1. Make the electrical connections on the distribution box and HT 6.
The terminating resistor in the MPI bus connector on the distributor box for
connecting the HHU must be disabled. (The HT 6 has an integrated MPI bus
Once power is present on the HT 6, the start screen for communication with
the HT 6 system software is displayed for some seconds. (Use key "6" be-
neath the key labeling "PARAM" to get to the data transfer rate selection
menu of the serial interface of the HT 6).
After the waiting time has expired or pressing a key, the message:
Waiting for PLC
V04.01.01 date time
Since function block FB 1 in the basic PLC program is not yet parameter-
ized, communication with the PLC does not yet take place.
2. Parameterizing function block FB 1 (editing FB 1 in SIMATIC Manager
The HT 6 is parameterized as the first and only MCP as an example:
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition