Rockwell Automation Technologies Incorporated

Rockwell Automation Asia Pacific Business Center Pte. Ltd.

Rockwell Automation Asia Pacific Business Ctr. Pte. Ltd.

Xiaofan Chen

Dale R Terdan

Soon Seng Kang

Liang Ge

An I/O circuit for measuring temperatures uses multiple cold-junction compensation sensors permanently affixed near the terminals of the terminal block in order to compensate significant temperature variation across the terminals of the I/O module (up to 3&#xb0; C.) that can substantially affect the accuracy of thermocouple measurements. The use of these multiple sensors is enabled by a compensation system that corrects for the distance between the built-in sensors and the terminals, a multiplexer that accommodates the additional signal burden produced by the sensors, and a compensation system that allows low-cost sensors to be used and calibrated to as little as a single high accuracy sensor. In one embodiment, a third temperature sensor with relatively higher accuracy is used to compensate for lower accuracy of permanently affixed sensors.

Enhancing thermocouple temperature measurement accuracy with local RTDs to compensate terminal temperature difference

An integral cable guide for an electronic module is provided. The electronic module includes a top housing with a ridge formed on one side. The top housing is configured to removably couple with a bottom housing to enclose electronic components. The electronic module further includes a receptacle within the top housing configured to receive a removable terminal block (RTB), such that a channel is formed between the ridge and the RTB when the RTB is placed within the receptacle. The channel guides cables coupled to the RTB to an outside edge of the module. The electronic module further includes at least one anchor that provides support for the cables.

Integral cable guide for electronic module

A current-loop output circuit for an industrial controller provides for low power dissipation and reduced part count by driving current loads of different resistances directly from a switched voltage source. Proper filtering and design of a feedback loop allows the necessary transient response times to be obtained.

Growing community of inventors

Singapore, Singapore

Xiaofan Chen