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1. SPECIFICATIONS OF MOTION SYSTEM COMPONENTS
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(3) Selection of base units and extension cables
(a) Selection of main base unit
Choose the main base unit according to the number of pulse
generator/synchronous encoder interface modules (A172SENC) and limit output
modules (A1SY42) fitted to the main base (number of motion slots) and the
number of sequencer I/O slots (number of sequence slots).
Selection of Main Base
Main Base Model
No. of Motion Slots
(No. of A172SENCs and A1SY42s)
No. of Sequence Slots
A172B 1 1
A175B 1 4
A178B 1 7
A178B-S1 2 6
A178B-S2 4 4
A178B-S3 8 0
(b) Selection of sequence extension base unit and extension cable
Choose the sequence extension base according to the number of MELSEC-A
series I/O modules fitted to the sequence extension base unit.
Selection of sequence Extension Base Unit
Extension Base Unit
Model
MELSEC-A Series I/O Modules
A1S65B
For extension power supply + 5 slots, applicable to system with up
to one extension base.
A1S68B
For extension power supply + 8 slots, applicable to system with up
to one extension base.
A168B
For extension power supply + 8 slots, applicable to system where
up to one extension base and GOT are bus-connected.
Choose the extension cable according to the distance between the main base
unit and sequence extension base unit and the type of the sequence extension
base unit. Note that the overall distance should be within 3m (9.84ft.).
Selection of Extension Cable
Extension Cable
Model
Length mm (inch)
Type of Sequence
Extension Base Unit
A1SC01B
55 mm (2.17 inch), flat cable for horizontal
extension
A1SC03B 330 mm (13 inch)
A1SC07B 700 mm (27.58 inch)
A1SC12B 1200 mm (47.28 inch)
A1SC30B 3000 mm (118.2 inch)
A1SC60B 6000 mm (236.4 inch)
For A1S6
B/A168B
A1SC05NB 450 mm (17.73 inch)
A1SC07NB 700 mm (27.58 inch)
A1SC30NB 3000 mm (118.2 inch)
A1SC50NB 5000 mm (196.9 inch)
For A6
B
POINT
Choose the motion modules and MELSEC-A series I/O modules so that the
sum of 5VDC consumed currents of the CPU module, motion modules,
MELSEC-A series I/O modules, synchronous encoders and manual pulse
generators connected to the main base unit is within 5 (A) for the
A173UHCPU/A172SHCPUN or 3 (A) for the A171SHCPUN.