AppNote Explain

HVAC

HVAC Applications

You can either use the built-in Analog Digtal Converter to connect to temperature sensors that can output 0-5V or 4-20mA, or using external temperature module that are equipped with communication capability to measure temperature.

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Using 10K Thermister for Temperature Measurement:

Thermistors can be used to measure temperature in many different environments. They are both rugged as well as low cost but are non-linear device. This application note explains how to physically connect a 10K Precon thermistor to the PLC using the PLCs on board ADC as well as how to use a look up table and interpolation method to calculate accurate temperature readings from the non-linear thermistor inputs.

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Measure temperature using ICP/DAS I-7018 Thermocouple Module.

Thermocouple are widely used in industry but their very low signal output (micro volts) would require amplification to get 0-5V for the PLC ADC input. Alternatively, you can purchase an IPC-DAS I-7018 module that has 8 built-in thermocouple ports. The following application shows how to communicate with I-70xx module via RS485 port.

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Remote I/Os

Remote I/O Application?

Each application note explains how to use an M-Series PLC to control another PLC or multiple PLCs in a remote I/O network. In each situation one M-Series PLC would be the master and either E10+ PLC/s or M-Series PLC/s would be the slaves and serve as remote I/O to the master. Each application note comes with a sample program.

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1) Using E10+ PLCs as Remote I/O - Basic

This application note explains how to use an M-Series PLC to control the E10+ PLC. The programming is fairly simple, allowing only a few E10+ PLCs to be controlled in the network.

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2) Using E10+ PLCs as Remote I/O - Advanced

This application note explains how to use an M-Series PLC to control the E10+ PLC. The programming is a bit more advanced but up to 255 E10+ PLCs can be used as remote I/O.

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3) Using another M-series PLCs as Remote I/O - Basic

This application note explains how to use an M-Series PLC to control a T100MD888+/T100MD1616+ PLC. The programming is fairly simple, allowing only a few T100MD888+/T100MD1616+ PLCs to be controlled in the network.

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4) Using another M-series PLCs as Remote I/O - Advanced

This application note explains how to use an M-Series PLC to control a T100MD888+ or T100MD1616+ PLC. The programming is a bit more advanced but up to 255 T100MD888+ or T100MD1616+ PLCs can be used as remote I/O.

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