1 - 1 1 - 1
MELSEC-Q
1 OVERVIEW
1 OVERVIEW
This User's Manual describes the specifications, handling and programming methods
for the type Q64AD-GH channel isolated high resolution analog-digital converter
module (hereinafter referred to as the Q64AD-GH) and type Q62AD-DGH channel
isolated high resolution analog-digital converter module (with signal conditioning
function) (hereinafter referred to as the Q62AD-DGH), which are used with the
MELSEC-Q series CPU modules.
The Q62AD-DGH is exclusively used for current input.
In this manual, the Q64AD-GH and Q62AD-DGH are collectively referred to as the A/D
converter modules.
1.1 Features
(1) Channel isolated
The channels are isolated.
The Q62AD-DGH is also isolated between the external supply power and
channels.
(2) High resolution
The resolution is as high as 32-bit signed binary (data part is 16 bits long). (When
the range -10 to 10V is selected)
(3) Power supply to 2-wire transmitter (Q62AD-DGH only)
Supplying power to the 2-wire transmitter, the Q62AD-DGH does not require the
power supply for the 2-wire transmitter.
Supply power can be switched ON/OFF channel-by-channel by the A/D
conversion enable/disable setting.
(4) Module protection provided by short-circuit protection circuit
(Q62AD-DGH only)
If an excessive current flows into the module due to a short circuit of the wiring,
the short-circuit protection circuit limits the current to within 25 to 35mA,
protecting the module.
(5) Analog input check by check terminals (Q62AD-DGH only)
Measurement of a voltage at the check terminals allows the mA of the 2-wire
transmitter output to be checked without the wiring being disconnected.
(6) High accuracy
The reference accuracy
1
is as high as ±0.05% and the temperature coefficient
2
is as high as ±71.4ppm/°C.
1 Accuracy of offset/gain setting at ambient temperature
2 Accuracy per temperature change of 1°C
Example) Accuracy when the temperature varies from 25°C to 30°C
0.05% (reference accuracy) + 0.00714%/°C (temperature
coefficient)
5°C (temperature variation difference) = 0.0857%
1
To Next Page
Loading...
