User`s manual

10-18
Data link DL1 (master station) function
10
(3) Wiring check
Check the wiring according to the following procedures, as error wiring may cause unstable operation
condition:
1 Switches OFF power and termination resistance switches of all stations.
2 Check resistance between each terminal.
- Connect the terminal L1 and L2 of the terminal station and check L1 and L2 termination
resistance of the other terminal stations.
- Make short L1 and the SHIELD at the terminal station and check the resistance between L1 and
the SHIELD of the other terminal stations.
After checking, remove the short wiring and switch ON the termination resistance switch at both
terminal stations.
Between L1 and L2
Between L1 and SHIELD
Between L2 and SHIELD
1 K ohms or up
Cable
total length
Cable type
HITACHI CABLE LTD.
15 ohms or less
50 ohms or less
100 ohms or less
FUJIKURA LTD.
10 ohms or less
30 ohms or less
60 ohms or less
Cable
total length
Cable type
HITACHI CABLE LTD. FUJIKURA LTD.
100 m
500 m
1 km
15 ohms or less
50 ohms or less
100 ohms or less
10 ohms or less
30 ohms or less
60 ohms or less
100 m
500 m
1 km