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MELSEC-A
4 SETUP AND PREPARATION BEFORE OPERATION
4.4 Offset/Gain Setting
When changing the I/O conversion characteristics, follow the procedure below.
Change the lit offset/gain adjusting LEDs with the
SELECT/SET switch, and make sure that the LED of
the channel whose offset/gain will be set and the
"GAIN" LED are lit.
Adjust other channels?
Open the TEST terminals (across 8-9).
The "RUN" LED is lit.
TEST
TEST
END
START
Short the TEST terminals (across 8-9) to enter the
test mode.
TEST
TEST
Every time the SELECT/SET switch is moved to
"SELECT", the offset/gain adjusting LEDs lit change
as shown below.
CH1 offset
value setting
CH1 gain
value setting
CH2 offset
value setting
CH2 gain
value setting
Change the lit offset/gain adjusting LEDs with the
SELECT/SET switch, and make sure that the LED
of the channel whose offset/gain will be set and the
"OFFSET" LED are lit.
Set all channels to any of "user range settings 1 to 3"
in the sequence program.
A
A
YES
NO
3 4 OFFSETGAINCH.1 2
3
4
OFFSET GAIN
Lit Lit
CH.1 2
Add the voltage or current that will be the offset value.
V
For voltage
COM
V+
For current
COM
V+
I+
A
3 4 OFFSET GAIN
Lit
Lit
CH.1 2
Add the voltage or current that will be the gain value.
V
For voltage
COM
V+
For current
COM
V+
I+
A
Move the SELECT/SET switch to "SET". Confirm that
the "RUN" LED is lit* and release your hand.
RUN SELECT
Lit
SET
Power ON
Start data link.
Make sure that the "RUN" LED is off.
Move the SELECT/SET switch to "SET". Confirm that
the "RUN" LED is lit* and release your hand.
RUN SELECT
Lit
SET
Power OFF
*: If the "RUN" LED is not lit, E
2
PROM may have failed. For details, refer to Section 6.1.