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DIP switch and indication LED is installed on the top of PLC. Normally D2 LED should be flicker-
ing as 4Hz frequency, D3~D6 should be OFF. Other LED is flickering depending on PLC commu-
nication condition.
4-position DIP switches should be OFF, 8-position DIP switch should indicates MODBUS slave
equipment address. 8-position DIP switch indicates 8 bit, number of 6 figures which has contrary
one bit as number of 2 figures. For example, basic setting place described in the picture below
(switch 2~8: ON and switch 1: OFF) indicates 0x7E and the contrary value is 0x01. Basic setting
of MODBUS slave address of chiller is 0x01.
Chiller Water-cooled Screw
Modbus Address: 0x01
4
3
2
1
D2 D3 D4 D5 D6 D7 D8 D9
RS -232
Communication
PLC Normal:
OFF
4Hz Blink
Fig. 12
- 28 -
6
2
8
7
5
4
3
1
MODBUS
Communication
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