Mitsubishi Electric MELSEC Q Series User Manual page 112

(2) Bus connection
Use the main base unit/extension base unit's extension cable connector for connection.
(a) How the C Controller module recognizes the GOT
If a GOT is connected in a bus topology, the C Controller module recognizes the GOT as an intelligent function
module of 16 I/O points.
Therefore, assign I/O to the C Controller module in GOT setup.
(For GOT bus connection, occupy one the extension base (16 points x 10 slots).)
For details of the GOT, refer to the following.
 Connection manuals for GOT2000 series (Mitsubishi Electric Products), (Non-Mitsubishi Electric Products 1),
(Non-Mitsubishi Electric Products 2), (Microcomputer, MODBUS/Fieldbus Products, Peripherals)
 Connection manuals for GOT1000 series (Mitsubishi Electric Products), (Non-Mitsubishi Electric Products 1),
(Non-Mitsubishi Electric Products 2), (Microcomputer, MODBUS Products, Peripherals)
(b) Maximum number of GOTs
Up to five GOTs can connected in a bus topology.
(c) Precautions
• In a bus topology, the GOT must be connected to the last base unit.
A GOT cannot be connected between base units.
• Select an appropriate extension cable for connecting the GOT to the bus so that the total extension cable
length is 13.2 m at maximum.
• A bus extension connector box (A9GT-QCNB) must be used if the first GOT is to be placed at a distance of
more than 13.2 meters away.
• For details of A9GT-QCNB, refer to the following.
A9GT-QCNB type Bus extension connector box User's Manual
• Configure the bus connection settings (extension base number and slot number settings) on the GOT
before activating the C Controller module and GOT.
• Power on the C Controller module and GOT in any of the following sequences.
• Power on the C Controller module and GOT at the same time.
• Power on the C Controller module and then GOT.
• The following system alarm may occur in the GOT at start-up, depending on the system configuration and
GOT settings.
"402 A communication timeout occurred. Check the communication path or module."
To avoid the occurrence of the above system alarm, set the GOT title display time to be sufficiently longer
than the C Controller module start-up time.
For how to set the GOT title display time, refer to the following.
GT Designer3 Version1 Screen Design Manual (Fundamentals)
(3) Connection via network modules
For connection via network modules, refer to the manual for respective network modules.
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