User Manual

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3-2 I/O Communication

3-17

Communicating with the GT-70A series

- DeviceNet Compatible Network Unit DL-DN1 User’s Manual (GT-70A) -

Reading comparator values (P.V. values) from sensor amplifiers

Comparator values (P.V. values) are read by reading the IN areas which are assigned

the ID numbers of sensor amplifiers.

Device assignments: "Comparator Value (P.V. Value)" (page 3-9)

This example illustrates how to read the comparator values from the sensor amplifiers

of ID 01, 02, and 03.

It assumes that the ope

rating mode assigned to the devices are "3-output mode +

current value, without extension."

(1)When the comparator value of a sensor amplifier is updated, the new comparator

value is entered into the IN area via I/O communication.

If the judgment value is correct, the parameter range is - 199.999 to +199.999.

If the current value is over range, under range, or

invalid, the previous value is

retained without updating the current value. Use the value with the judgment value

property.

(2)The property of the comparator value is entered. If the comparator value of a

sensor amplifier is "over", "under," or "invalid," the bit corresponding to the ID

number of that sensor amplifier flips to 1.

Notices when the calculation function is set to ON

• When the setting is other than standard difference display, the

comparator value (P.V. value) of the main unit cannot be read. Both

the main unit and the expansion unit read the raw value (R.V.

value). When you read the comparator value (P.V. value) from the

main unit, use explicit messaging.

• When the setting is standard difference display, the main unit

reads the raw value (R.V. value) and the expansion unit reads the

comparator value (P.V. value).

PLC

(2)

Comparator value property

Each bit of IN [n+4]

Comparator value of ID 01

1234 4567 6789

IN area [n+5 to 6]

Comparator value of ID 02

2345 5678 7890

IN area [n+7 to 8]

Comparator value of ID 03

3456 8901

IN area [n+9 to 10]

Sensor amplifier