The module uses differential inputs to reduce effects of electrical the
logic and from each other. This module is operated in an identical way
to the PM8TC module and is fully interchangeable. The thermocouple
voltage is read by the module circuitry, linearised and converted to
degrees Centigrade. No ranging is required as the module covers the
full range as indicated in the TC table. The value that is read from the
Modbus register is the actual temperature in degrees centigrade to
ie: a value of 3451 corresponds to a temperature of 345.1°C.
The thermocouple type is setup by writing a value to the TC Type
The value is obtained from the table below. For example to select type
K thermocouples, the value "2" must be written to the TC Type register.
All 8 thermocouple inputs adopt the same TC type.
The DIP switch 9 is used to select upscale or downscale burnout.
A value of 32768 is used to indicate upscale burnout and a value of
-32767 is used to indicate downscale burnout.
The module has built in Cold Junction Compensation. Use must be
made of the correct thermocouple extension wire to avoid reading
The thermocouple module can also be configured for a 0 - 50mV input
range. The TC Type register must be set to 9 for this option. The value
in the register which is read back over the network is 0 - 50,000.