Remote Od - Mitsubishi Electric A1SJ71PB96F User Manual

4. FUNCTIONS
4.5.3
In the PROFIBUS the client reads the server local OD using the GetOD service and maintains this
information in the local station to be used while communicating. This maintained information is called
the remote OD.
(1) AJ71PB96F/A1SJ71PB96F remote OD management
The remote ODs managed by the AJ71PB96F/A1SJ71PB96F are divided into two types:
Automatic management remote OD (hereafter automatic remote OD) and preload remote OD.
In the AJ71PB96F/A1SJ71PB96F the remote OD is managed for each communication and a
maximum of 26 remote ODs can be managed for one communication. However, this number is
the total of the automatic remote ODs and preload remote ODs, and a maximum of 20 preload
remote ODs can be set for one station. Preload remote ODs are set using the software package.
Automatic remote ODs use vacant space in the preload remote ODs.
(a) Automatic remote OD

Remote OD

When the AJ71PB96F/A1SJ71PB96F issues a Read/Write service, if the specified variable
remote OD is not stored in the AJ71PB96F/A1SJ71PB96F, the AJ71PB96F/A1SJ71PB96F
automatically issues a GetOD to acquire the variable remote OD and this acquired remote
OD is stored in the AJ71PB96F/A1SJ71PB96F.
ACPU
Read/Write
Request
Read/Write
End
AJ71PB96F
A1SJ71PB96F
OD header search
Yes
Yes No
OD header
storage
Variable OD search
Yes
Yes No
Variable OD
storage
Data type search
Yes
Yes No
Data type
storage
Read/Write issued
4-15
MELSEC-A
Parther station
GetOD
OD header
acquisition
GetOD
Variable OD
acquisition
GetOD
Data type
acquisition
Read/Write