Mitsubishi Electric GOT2000 Series Connection Manual page 616

■8. Connecting one PLC with multiple GOT units
When multiple GOT units are simultaneously accessing one PLC, the GOT writing process (transient/cyclic) and
reading process (transient) may slow down.
This slow access can be remedied with the following countermeasures.
<Countermeasures>
(1) Improve response speed on PLC side
Insert a COM instruction on the PLC to increase the response speed. Note that caution is required as the scan time
will increase.
(2) Screen design using cyclic devices
Create the screen with cyclic devices instead of using transient devices.
(3) Split GOT connection destinations into several systems
Add a master/local unit on the PLC side, and split the GOT connection destinations into several systems.
Improve the current system configuration.
(Example of current system configuration)
With the following system configuration, access from the GOT is concentrated at one unit.
(Improvement measure)
(a) Add unit on PLC side
Add a unit on the PLC side to disperse the GOT access destinations.
(b) Split the network
Split the network to disperse the GOT access.
10 - 38
10.5 Precautions
GOT access is concentrated at one unit
GOT GOT
station station
Add station No. 2 to disperse the GOT access
No. 1 No. 2
GOT GOT
Access to station No. 1
GOT
GOT
GOT GOT
GOT GOT
Split the network to disperse the GOT access
GOT GOT
GOT GOT
GOT GOT
GOT GOT
Access to station No. 2