Mitsubishi A1SD75M1, User Manual

Page: 337 / 746

8 - 3
MELSEC-A
8 ZERO POINT RETURN CONTROL
Zero point return auxiliary functions
Refer to section "3.3.4 Combination of AD75 main functions and auxiliary
functions" for details on "auxiliary functions" that can be combined with zero point
return control. Also refer to "Chapter 12 CONTROL AUXILIARY FUNCTIONS" for
details on each auxiliary function.
[Remarks]
The following two auxiliary functions are only related to machine zero point
returns.
Auxiliary function name
Machine zero point
return
High-speed zero
point return
Reference
Zero point return retry function Section 12.2.1
Zero point shift function Section 12.2.2
: Combination possible, : Restricted,
: Combination not possible
When a zero point return is not required
Control can be carried out ignoring the "zero point return request flag" ( Md.40
Status: b3) in systems that do not require a zero point return.
In this case, the "zero point return parameters ( Pr.45 to Pr.59 )" must all be set
to their initial values or a value at which an error does not occur.
Zero point returns from peripheral devices
"Machine zero point returns" and "high-speed zero point returns" can be executed
from the AD75 software package test mode.
Refer to the AD75 software package operating manual for details on zero point
returns from the AD75 software package.
Zero point return in absolute position detection system
When machine zero point return control is executed in the absolute position
detection system, access is made to the FeRAM (Ferroelectric Random Access
Memory).
The FeRAM access count is maximum 9.9999 10
9
times.
When the " Md.120 FeRAM access count" exceeds 9.0000 10
9
times, a warning
"FeRAM count warning" (warning code: 10) occurs.
When the FeRAM access count exceeds 9.9999 10
9
times, an error "FeRAM
count over" (error code: 10) occurs. In this case, the AD75 has reached the end of
its service life. Therefore, replace the module.
When the FeRAM access count exceeds 9.9999 10
9
times, the absolute position
(zero point position) cannot be restored normally at a system startup (power on,
reset, etc.).