# FANUC Series 16/18/160/180-Model C Connection Manual (Hardware)

B–62753EN/01
7. CONNECTION TO CNC PERIPHERALS
205
Series 16/18 employ the serial pulse coder, for which the power supply
5 VDC, same as for the conventional pulse coder. It is therefore necessary
to prevent cable resistance from causing the supply voltage to drop by less
than 0.25 V (total for both the 0 V and 5 V lines).
This is written as:
0.25 y
0.40 ³ R ³ 2L
m
L x
m
3.2R
0.40 : 0.40 A power supply current of the
incremental pulse coder
R : Resistance per unit length of the
wire [/m]
m : Number of wires connected in each
0 V and 5 V line
L : Wire length (m)
This can be converted to
the following equation:
This cable, developed for the pulse coder interface, consists of three pairs
of signal wires and six power line wires (20/0.18, 0.0394/m). When
this cable is used, the maximum cable length is calculated as follows:
L x
3
3.2 ³ 0.0394
+ 23.79[m]
This cable has a diameter of 8.5 mm and is suitable for use with the
connector of this control but cannot be extended up to 50 m.
This cable, specified as cable C in the connection manual (B-61393E) for
Series 0–C, consists of five pairs of signal wires and six power line wires
(50/0.18, 0.016/m).
When this cable is used, the maximum cable length is calculated as
follows:
L x
3
3.2 ³ 0.016
+ 58.59[m]
This cable can be extended up to 50 m from an electrical point of view.
However, because of its 11 mm diameter, it does not fit very securely into
the cable clamp.
It is therefore necessary to use a larger size connector at a terminal block
or peel off the insulation sheath at the end of the cable to reduce the
diameter so that it fits into the connector.
A66L-0001-0286
NC
A66L-0001-0157
Pulse coder
For example, MR connector manufactured
by Honda Communications
NC
A66L-0001-0157
Pulse coder
Enlarged figure
Example 1)
Example2)
Terminal
block
Peel off the insulation sheath and cover with a heat shrinkable tube
Cable connection for the
absolute pulse coder
When A66L–0001–0286
cable is used
When A66L–0001–0157
cable is used