
9.CONNECTION B-65282EN/05
- 216 -
Connector pin assignment
JA7A and JA7B
9 5V (Note 1)
7
5
3 SOUT
1 SIN
10
8
6
4 *SOUT
2 *SIN
19
17
15
13
11
20 5V (Note 1)
18 5V (Note 1)
16 0V
14 0V
12 0V
NOTE
1 The +5V pin is intended for optical link transmission
based on the optical I/O link adapter. Do not use it
when a metal cable is being used; otherwise, the +5
V line of the CNC will be short-circuited with that of
the SPM or SPMC.
2 SPM or SPMC serial interface connection using an
optical fiber cable
The use of an optical I/O link adapter with the SPM
or SPMC serial interface extends the maximum
allowable length of the optical fiber cable to up to
200 m.
Use optical fiber cables in the following cases:
- When the required cable length is 20 m or longer.
- When the cable must be extended across multiple
cabinets, and the cabinets cannot be connected
with a grounding wire 5.5 mm
2
or larger.
- The cable may be affected by noise, for example,
if the cable is laid near a strong magnetic noise
source like a welding machine or in parallel with a
power line over a long distance.