Plc Basic Program (P3); Reference Point Approach (R1); Signals To Channel (Db21 - Siemens SINUMERIK 840Di Function Manual

2.13

PLC basic program (P3)

2.13
For a description of the NC/PLC interface signals, refer to:
References:
/FB1/ Description of Functions Basic Machine;
Power line basic PLC program (P3) / Solution line basic PLC program (P3 sl),
Section: "Signal/Data Descriptions".
2.14

Reference point approach (R1)

2.14
2.14.1

Signals to channel (DB21, ...)

DB21, ...
DBX1.0 Activate referencing
Edge evaluation: yes
Signal state 1 or Channel-specific referencing is started using the interface signal:
edge change DB21, ... DBX1.0 (activate referencing).
0 → 1 The control acknowledges a successful start using the interface signal:
DB21, ... DBX33.0 (referencing active)
Each machine axis assigned to the channel can be referenced with channel-specific referencing
(this is achieved internally on the control by simulating the plus/minus travel keys).
Using the axis-specific machine data:
MD34110 $MA_REFP_CYCLE_NR (axis sequence for channel-specific referencing)
it is possible to define in which sequences the machine axes are referenced.
When all of the axes entered in REFP_CYCLE_NO have reached their reference point,
the interface signal:
DB21, ... DBX36.2 (all axes referenced)
is set.
Application If the machine axes are to be referenced in a particular sequence, the following options are
example(s) available:
•
•
•
Corresponding to .... DB21, ... DBX33.0 (referencing active)
DB21, ... DBX36.2 (all axes with obligatory reference point are referenced)
NC/PLC Interface Signals (Z1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Signal(s) updated: cyclic
The operator must observe the correct sequence when starting.
The PLC must check the sequence when starting or define it itself.
The channel-specific referencing function is used.
Detailed Description
2.13 PLC basic program (P3)
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