The THM409 and 449 (four channels), THM809 and 889 (eight channels), and the THM166 (sixteen channels) have a resolution of 0.5°C or °F and report temperature values to the PLC %AI I/O table in 0.5°C or °F increments.

These models feature open circuit detection, where the temperature value written to the %AI register goes to its maximum value upon an open circuit condition. The THM449, THM889, and THM166 also feature %I alarm bits which energize on the same open circuit condition.

The THM665 is identical to the 668 with the addition of a 50Hz notch filter (European line frequency) and the THM666 is identical to the 668 with the addition of a 60Hz notch filter (US line frequency). The purpose of these filters is to eliminate noise generated by power lines.

The THM884 and 888 provide 8 channels with high resolution (0.1°C). Revisions H and later provide the autodetect cold junction compensation feature. Otherwise both models operate exactly as the THM668. The THM888 additionally incorporates a 60Hz notch filter.

These Series 90-70 modules provide eight (THM260) or sixteen (THM160) channels of thermocouple input with 0.1°C resolution. Ten thermocouple types are supported; J, K, N, T, E, R, S, B, C, and JX (extended J). Thermocouple type is selectable on a channel-by-channel basis. The module allows the direct connection of thermocouple sensors, without the need for external signal conditioners and standard analog input modules. The thermocouple voltage is converted to a digital value, cold junction compensated, and the appropriate temperature value is reported directly to %AI registers in 0.1° or 0.5° increments. The temperature value may be reported in °C or °F increments. Various configuration parameters, as well as high and low setpoints for each channel, are available using %AQ output registers.