
R: Resistance per unit length of the
wire (W/m)
m: Number of wires connected in each
0 V and 5 V line
L: Wire length (m)
B–62073E/04
7. CONNECTION TO CNC PERIPHERALS
266
(1)Cable connection for the incremental pulse coder
Series 15–B employ a serial pulse coder for which the power supply
is 5 VDC, same as used by the conventional pulse coder. It is necessary
to suppless the cable resistance used for the power supply to 0.5 V or
less (total for both the 0 V and 5 V lines).
This is written as:
0.5
+
u
R 2L
m
This can be converted to the
following equation:
L
+
t
m
4R
(a) When A66L–0001–0286 cable is used:
This cable, developed for the Series 15–B/16/18 pulse coder interface,
consists of three pairs of signal wires and six power line wires
(20/0.18, 0.0394 W/m). When this cable is used, the maximum cable
length is calculated as follows:
L
+
t
3
4 0.0394
+19[m]
This cable has a diameter of 8.5 mm and is suitable for use with the
Series 15–B/16/18 and 18 connector. However it cannot be extended
up to 50 m.
(b)When A66L–0001–0157 cable is used:
This cable, specified as cable C in the connection manual (B–61393)
for Series 0, consists of five pairs of signal wires and six power line
wires (50/0.18, 0.016 W/m).
When this cable is used, the maximum cable length is calculated as
follows:
L
+
t
3
4 0.016
+ 46.87 [m]
This cable can be extended up to 46 m from an electrical point of view.
However, because of its 11 mm diameter, it does not fit very securely
into f cable clamp for Series 15–B cable.
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.
Example 1)
For example, MR connector manufactured by Honda Communications
Pulse corder
Terminal
block