Specifications

Analog Modules

A68AD

Analog voltage/current

Welder

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Analog input module specifications

Analog input modules are available for all MELSEC QnA/A

Series PLCs. Each is capable of accepting either current or

voltage variable input signals. These signals are then

converted in to a binary value by a built-in microprocessor,

and can then be used for processing within the sequence

program. Input signals can be instantaneously read, or they

can be sampled for user programmable time/count

averaging processing. Setting offset and gain values for the

converted values is also possible.

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Intelligent A/D conversion using built-in microprocessors

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System configuration example

Part number A68AD (-S2)

Applicable QnA/A Series PLC QnA/A Series

Number of output channels 8 channels

Analog output

Voltage: -10 to 0 to +10, input resistance 30k ohms

Current: +4 to +20 mA, input resistance 250 ohms

Digital input -2048 to +2047

Maximum resolution Voltage: 5 mV (1/2000), Current: 20 µA (1/1000)

Overall accuracy ±1%

Maximum conversion time 2.5 ms

Absolute maximum analog output Voltage: ±15 VDC Current: ±30 mA

Insulation method

Photocoupler insulation between input terminals and internal circuity

No insulation between channels

I/O points required 32 points

Note: The A68AD-S2 type and log input module can be specially used to set a valid/invalid flag for the A/D transfer of each channel.

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A68AD/A68AD-S2

Analog input modules

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