Mitsubishi GOT2000 Series Connection Manual

4. HOW TO MONITOR REDUNTANT SYSTEM
4.2 Direct CPU Connection
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HOW TO MONITOR REDUNTANT SYSTEM
4.2.3 Precautions when connecting a GOT directly to a PLC CPU in the redundant
system without making Q redundant setting
(1) As the GOT monitors exclusively the PLC CPU that is directly connected to, the monitor target cannot be
changed in response to the system switching of the redundant system.
To change the target monitor in response to the system switching, change the target of the connection cable
between the GOT and PLC CPU to the other PLC CPU, or configure the system using GOTs connected to each
PLC CPU.
(2) In CPU direct connection, when monitoring a PLC CPU in the redundant system, only the PLC CPU that is
directly connected to the GOT can be monitored.
(3) When connected to the standby system PLC CPU, the writing of the GOT to a device in the connected PLC
CPU is not reflected. Design a monitor screen that disables writing to the standby system.
In the redundant system, the tracking function transfers device data from control system to standby system.
When the tracking function is enabled, the device value of the standby system PLC CPU is overwritten by the
device value transferred from the control system to the standby system even if the GOT writes to the standby
system PLC CPU (Numerical input, Ascii input, Script, Recipe, or others).
As countermeasures to the above, perform the following.
• Display a monitor screen which indicates that "the connected PLC CPU is the standby system" on a GOT
when connecting the GOT to the standby system PLC CPU.
• To display the specified monitor screen when connecting the GOT to the standby system PLC CPU, use the
special relay SM1515 (Control status identification flag) of the PLC CPU.
(When the SM1515 is OFF, the connected PLC CPU is the standby system)
• Control the operation of each object by the SM1515, which is set for the operation condition.
• For the screen switching device, use a GOT internal device.
If a device of the PLC CPU is used, the trigger action operation of the GOT may be disabled since the device
data of the PLC CPU will is overwritten by the device value transferred with the redundant system tracking
function.
1) Numerically input D100=100
from the GOT.
1) D100=100
2) D100=5
2) Tracks D100=5 from control
system to standby system.
Power supply module Power supply module
Power supply module
MELSECNET/H remote I/O network
CPU direct connection CPU direct connection
GOT1
Control system
(System A)
Empty Empty
Empty Empty
Q25PRHCPU QJ71LP21-25 QJ71BR11 QJ71E71-100 QJ61BT11N
Standby system
(System B)
QJ72LP25-25 QJ71C24N
Q25PRHCPU QJ71LP21-25 QJ71BR11 QJ71E71-100 QJ61BT11N
GOT2

Mitsubishi GOT2000 Series Specifications

General

Power Supply	24VDC
Software	GT Works3
Processor	RISC CPU
Interface	Ethernet, USB, RS-232, RS-422/485
Operating Temperature	0°C to 50°C
Display Type	TFT LCD
Storage Temperature	-20°C to 60°C
Humidity	10% to 90% (non-condensing)
Shock Resistance	147 m/s² (15G), 11ms duration
Touch Panel	Analog Resistive