Precautions - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.36 External Search
Restrictions
The following restrictions are imposed on return to the previous program before the external search.
 When the following operations are performed after completing the external search, this function cannot return to the stored
program.
- Operation search
- Restart search
- Check search (foreground)
- Search & start
 When the following function is executed after completing the external search or while the externally searched program is
running, the control fails to return to the stored program.
- Macro interrupt
 Program can be returned to the one before external search is performed when the stored device is in either of the following
conditions.
- Either the device of the program which was executing before the external search or the device of the program for exter-
nal search is a memory.
- The device of the program which was executing before the external search and the device of the program for external
search is the same.
For device types, refer to "External search device No." of "14.36.2 PLC -> NC Interface Signal".

14.36.5 Precautions

(1) Even if the external search strobe is already OFF when the NC finishes the external search, the external search finished
signal will turn ON for one cycle of the user PLC.
(2) Note the following points to return to the previous program before the external search.
(a) While the parameter "#1288 ext24/bit2" is "1", the control returns to the stored program if you execute reset before or
during the operation of the externally searched program.
(b) While the parameter "#1288 ext24/bit2" is "1", the control returns to the stored program at the time of cancelling emer-
gency stop.
(c) While the parameter "#1288 ext24/bit3" is "1", the control fails to return to the stored program during the operation
even if the program return signal is input.
(d) When the external search is carried out in the condition that the previous program before the external search is un-
searched, the program becomes unsearched state after returning.
(e) When the next operation is executed after returning from the externally searched program, and if the stored program
is absent due to deletion, etc., the program error (P232) occurs.
(f) Even if you execute external search continuously, the control returns to the previous program before the first external
search.
(g) If you turn the power OFF after running the externally searched program, the control returns to the last searched pro-
gram before the external search when the power is turned ON again.
(h) Do not execute external search or return to the stored program in the condition that axes configuration is changed by
a mixed control command. The axes configuration before the external search and the axes configuration after execut-
ing the externally searched program need to be the same. Difference between the two axes configurations may cause
an illegal operation after returning to the program before the external search.
(i) Restart search cannot be executed for an externally searched program. If attempted, the operation message "Search
error" appears. It is possible to execute the restart search for a program other than externally searched programs by
the program number designation.
(j) When the externally searched program is edited and saved, the control fails to return to the stored program. However,
if the editing was canceled without saving, the control can return to the stored program.
IB-1501668-B 872