Precautions - Mitsubishi Electric GT14 User Manual

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23.5 Precautions

Connection to QnA (S) CPU type
Use B or a later function version of Ethernet module
(QnA Series) and PLC CPU (QnA/QnASCPU type).
Connection to QSCPU
The GOT can only read device data and sequence
programs by the ladder monitor function in the QSCPU.
The GOT cannot write any data to the QSCPU.
Connection to Q170MCPU
The CPU to be monitored can be selected by the [CPU
No.] setting in the device settings.
(1) When the CPU No. is set to "2"
The device of the Motion Controller CPU area (CPU
No.2) is monitored.
(2) When the CPU No. is set to "1"
The device of the PLC CPU area (CPU No.1) is monitored.
(3) When the CPU No. is set to "0"
The monitoring target differs depending on the GOT
connection destination.
GOT connection destination
QJ71E71
PERIPHERAL I/F
When the setting of CPU No. is set to the number other
than "0" to "2", a communication error occurs and the
monitoring cannot be executed.
For setting the CPU No., refer to the following manual.
GT Designer3 Version1 Screen Design Manual
Example) Setting dialog box of the bit device
Connection in the multiple CPU system
When the GOT is connected to multiple CPU system, the
following time is taken until when the PLC runs.
QCPU (Q mode), motion controller CPU (Q series): 10
seconds or more
MELDAS C70: 18 seconds or more
When the GOT starts before the PLC runs, a system
alarm occurs. Adjust the opening screen time in the
GOT setup so that no system alarm occurs.
GT Designer3 Version1 Screen Design Manual
23 - 56
23. ETHERNET CONNECTION
23.5 Precautions
Monitoring target
PLC CPU area (CPU No.1)
Motion CPU area (CPU No.2)
Connection to LCPU
LCPU may diagnose (check file system, recovering
process, etc.) the SD memory card when turning on the
power or when resetting.
Therefore, it takes time until the SD memory card
becomes available. When the GOT starts before the
SD card becomes available, a system alarm occurs.
Adjust the opening screen time in the GOT setup so
that no system alarm occurs.
GT Designer3 Version1 Screen Design Manual
When connecting to multiple GOTs
(1) Setting PLC No.
When connecting two or more GOTs in the Ethernet
network, set each [PLC No.] to the GOT.
23.3.1 Setting communication interface
(Communication settings)
(2) Setting IP address
Do not use the IP address "192.168.0.18" when using
multiple GOTs.
A communication error may occur on the GOT with the
IP address.
(3) Setting for starting up multiple GOTs simultaneously
(When connected to Built-in Ethernet port CPU)
When connecting multiple GOTs to one Built-in
Ethernet port CPU, adjust the timing of GOT
communication start.
When the communication concentrates on the PLC, the
communication between GOT and PLC becomes
difficult, and the monitoring by GOT may not start.
As a method for adjusting the timing, communicating
one GOT alone first, and then communicating the other
GOTs is effective.
Set the following items on each GOT.
• [Startup Time] of [Controller Setting], or [Title Display
Time] of [GOT Setup].
• [Timeout Time] of [Controller Setting]
The following shows a setting example.
HUB
GOT1
QnUDE(H)CPU
Item
Startup Time
Timeout Time
When connecting to the multiple network
equipment (including GOT) in a segment
By increasing the network load, the transmission speed
between the GOT and PLC may be reduced.
The following actions may improve the communication
performance.
• Using a switching hub
• More high speed by 100BASE-TX (100Mbps)
• Reduction of the monitoring points on GOT
GOT2
GOT10
GOT1
GOT2
GOT10
0sec (default)
1sec
1sec
3sec (default)
4sec
4sec

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