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MELSEC-A
4 SETUP AND PREPARATION BEFORE OPERATION
(2) AJ65VBTCU-68ADIN
1 Shield
2
FG1
Signal souce 0 to 20mA
AG
250
CH.8 I+
CH.8 I-
NC
SLD
CON8 CH.8
1
2
3
4
250
CH.1 I+
CH.1 I-
NC
SLD
CON1 CH.1
1
2
3
4
1 Shield
2
500k
500k
500k
500k
3
1 Use a two-core twisted shield line for the power cable.
2 Indicates the AJ65VBTCU-68ADIN input resistor.
3 Always perform grounding for FG1. When there is a lot of noise, it may be better ground AG
as well.
If the grounding wiring (grounding yes/no) is changed after the offset and gain are set,
perform the setting of the offset/gain values again.
POINT
• A/D conversion values are fluctuated by self-heating within approx. 30 minutes
after power is turned ON.
• Do not insert the one-touch connector plug for I/O of the one-touch connector
type/connector type compact remote I/O unit into the one-touch connector for
analog I/O accidentally.
Doing so can cause the module to be damaged.
• In an unused channel, if terminals remain open, an erratic digital value may be
output.
To prevent this, take any of the following measures.
1. Select Prohibit in the A/D conversion enable/prohibit setting for the unused
channel.
Note that changing the setting from Enable to Prohibit will reduce the
sampling cycle.
2. Short-circuit the input terminals (terminal V+ and V-) of the unused channel.
3. Connect the AG terminal to the GND terminal of the external device.
