Instruction manual

1. GENERAL DESCRIPTION
1 − 3
NOTES
(1) A servo system CPU can be connected to a maximum of four motion
extension base unit.
(2) The motion extension base units which can be used are indicated below.
• A255B (control power supply not required)
• A268B (control power supply required)
(3) When using a teaching unit A31TU-E with dead-man switch, a dedicated
connecting cable A31TUCBL03M is required between the CPU module
and A31TU-E connector. If the A31TU-E is connected directly to the
RS422 connector of the CPU without using a dedicated cable, the A31TU-
E will not operate at all.
After disconnecting the A31TU-E, attach a short-circuit connector
A31TUSHORTCON for A31TUCBL.
(4) When the power supply to the servo system CPU is switched ON and
OFF, erroneous process outputs may temporarily be made due to the
delay between the servo system CPU power supply and the external
power supply for processing (especially DC), and the difference in startup
times. For example, if the power supply to the servo system CPU comes
on after the external power supply for processing comes on at a DC output
module, the DC output module may temporarily give erroneous outputs
when the power to the servo system CPU comes on. Accordingly a circuit
that ensures that the power supply to the servo system CPU comes on
first should be constructed.