AH500 Module Manual
5-38
5.1.12.2 Troubleshooting Procedure
Return the module to the factory for repair.
The external voltage is abnormal.
Check whether the external 24 V power supply to
the module is normal.
The factory correction is abnormal.
Please contact the factory.
The signal received by channel 0 exceeds
the range of inputs which can be received
by the hardware.
Check the signal received by channel 0.
The signal received by channel 1 exceeds
the range of inputs which can be received
by the hardware.
Check the signal received by channel 1
The signal received by channel 2 exceeds
the range of inputs which can be received
by the hardware.
Check the signal received by channel 2.
The signal received by channel 3 exceeds
the range of inputs which can be received
by the hardware.
Check the signal received by channel 3.
5.2 AH08PTG-5A
5.2.1 Overview
The specifications for a temperature measurement module, the operation, and the programming are
described in this section. AH08PTG-5A is a temperature measurement module. It converts the
temperatures received from its eight thermocouples into digital signals. Users can select the degree
Celsius or the degree Fahrenheit as a unit of measurement for temperature.
5.2.2 Characteristics
(1) A sensor is selected according to practical application.
Pt100/Ni100/Pt1000/Ni1000 sensor
(2) The channels in a module are isolated from one another.
Every two channels in a module form a group. There are four groups. The groups are isolated
from one another by transformers. Every group has its independent power and analog-to-digital
circuit. The speed at which the module converts analog signals into digital signals is increased.
If a channel in a group is damaged, the operation of other channels will not be affected.
The channels in a group are isolated from each other by an optocoupler. They do not form a
circuit.
(3) Conversion speed
The two channels in a group convert the temperatures they receive into digital signals. A fast
mode can only be applied to one of the channel in a group. If users want to use the fast mode, it
is suggested that they should use a four-wire/two-wire configuration. If a three-wire RTD is used
in the quick mode, there will be a need for thermocouple compensating cables and reliability,
and the conversion time required will be the same as that in a general mode.
Quick mode:
Four-wire/Two-wire configuration: 20 ms/channel
Three-wire configuration: 200 ms/channel
General mode: A conversion time will be gotten after the conversion time of the two
channels in a group is added up.
Two-wire/Four-wire configuration: 200 ms/channel
Three-wire configuration: 400 ms/channel
To Next Page
Loading...
