Adjustment In Absolute Position Detection System; Operation When No Absolute Position Has Been Established; Selecting The Type Of Absolute Position Initialization Set - Mitsubishi Electric C70 Setup Manual

7.3 Adjustment in Absolute Position Detection System

(Note) This adjustment is available when the sequence programs for machine control are installed in PLC CPU so
that the CNC servo axis can be operated.

7.3.1 Operation when No Absolute Position has been Established

If zero point has never been initialized or if the absolute position is lost, the alarms "Z70 ABS. ILLEGAL" and "Z71
DETECTOR ERROR" will occur. Then the "Initialization incomplete" signal in the PLC interface table will be turned ON.
This state, where the coordinate system is not established, gives the following limitations to each mode. Carry out the
absolute position initialization set to establish the coordinate system.
Operation in each mode
Operation mode
Memory/MDI
JOG feed
Rapid traverse
Handle
Step
ZP-RTN
(Note 1) The program error (P430) will occur.
(Note 2) "M01 OPERATION ERROR 0024" will occur when an axis is started before the absolute position is
established. (This mode is valid for the axis for which the absolute position has been established.)

7.3.2 Selecting the Type of Absolute Position Initialization Set

The absolute position zero point initialization set is required before starting up the absolute position detection system.
There are two types of the absolute position zero point initialization set, "dogless-type" and "dog-type". "Dogless-type"
has two methods, "machine end stopper method", "marked point alignment method I" and "marked point alignment
method II".
Set the parameter "#2049 type" for the type and method of absolute position zero point initialization set.
■ Dog-less type
■
Dog type
(Note) The type of absolute position zero point initialization set is decided by the machine and axes specifications.
Confirm which type is given in the machine specifications.
Select [TOOL PARAM] ---> [MENU (MENU 5)] ---> [SETUP (MENU 4)] ---> "Y" ---> "INPUT" --->[AXIS] , and scroll the
page to display the [ZERO-RTN PARAM] screen to set "#2049 type". After setting "#2049 type", turn the CNC power ON
again.
Type of absolute position initialization set
Dogless-type
Movement command invalid (Note 1)
(Including G28)
Valid
Valid
Valid
Valid
Starting not possible (Note 2)
Machine end stopper method
Marked point alignment method I
Marked point alignment method II
7.3 Adjustment in Absolute Position Detection System
Dog-type
Movement command invalid (Note 1)
(Excluding G28)
Valid
Valid
Valid
Valid
Starting possible
"#2049 type"
Automatic initialization 1
Manual initialization 1
2
4
3
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