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8. Digital I/O Connection Method
1. Digital Input Unit
l Input scheme of Dry-Contact Type
TB1
CH1
RY1 POINT OF CONTACT RY1 COIL
UNIT INSIDE UNIT OUTSIDE
TB8
CH8
RY8 POINT OF CONTACT RY8 COIL
GND SOURCE TB9 COMMMON TERMINAL BOX
D/I UNIT TERMAINAL BOX
1. First of all, RYⓝ operates according to external sequence.
2. RYⓝ’ s contact points are contacted and it turned On.
3. D/I unit’ s common terminal (ground) is connected to TBⓝ through relevant
relay’ s point of contact
4. D/I UNIT recognizes that relevant channel is active (On).
● ! Caution: Connection of D/I Unit
-. This D/I unit is set as a Dry-Contact Type at basis when shipping.
Therefore, this unit should not be approved with any signal other than signal
of relay’ s point of contact.
-. This D/I unit offers 1 common line per 8 CH. Therefore, when it is connected
to outside relay, this common line should be linked to relay’ s point of
contact on one side necessarily.
-. Power supply for outside relay coil drive is not offered with Data Logger. If
power is needed, it must be offered separately.
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