Mitsubishi Electric Q26UD(E)HCPU User Manual page 50

Melsecq series

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(3) Precautions

• When a GOT is bus-connected to the CPU module, connect the GOT after the last base unit in the system.

Do not position the GOT between base units.

• Extension cables for connecting a GOT on the bus must be a maximum of 13.2m in total length.

• A bus extension connector box (A9GT-QCNB) is required when a first GOT connected on the bus is installed

13.2m or more away from the main base unit. (Note that the bus extension connector box cannot be used for

the Q00JCPU.)

For details of the A9GT-QCNB, refer to the following.

A9GT-QCNB Type Bus Extension Connector Box User's Manual

• When a redundant base unit (Q3RB/Q6RB/Q6WRB) is used, a GOT cannot be bus-connected.

• When the QA1S6B extension base unit is used, connect the GOT after the last extension base unit in the

system, but assign I/O numbers subsequent to those of the Q6B/Q5B.

• When the QA1S5B, QA1S6ADP+A1S5B/A1S6B, QA6B, or QA6ADP+A5B/A6B extension base

unit is used, a GOT cannot be bus-connected.

• Before starting up the CPU module, set the extension level number and slot number (initial setting) in the

GOT to be bus-connected.

• Apply the power to the CPU module and GOT by either of the following way.

1) Simultaneously power on the CPU module and GOT.

2) Power on the CPU module first, and then the GOT.

• For the applicable GOT, refer to Page 39, Section 2.3 (1).

• Ground the FG wire of the cable connecting the programmable controller and the GOT on the GOT side.

For the grounding method, refer to the manual for the GOT used.

Q38B main base unit

Q68B extension base unit

QA1S68B extension base unit

stage number

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