Description
The GE IC670ALG310 module is a voltage-source analog output module. It is designed with 8 different channels for voltage outputs that can be auto scaled as configured by the operators. The module takes the input from the bus interface unit that is connected to it and enhances the data for calibration and converts the data into output voltage in a range between -10 and +10 Volts. The IC670ALG310 output module has enhanced diagnostics. It can easily detect over range and under range situations, loss of user power, and an uncalibrated module. The output module also features alarms that can be set by the users for different events. The module treats output values as under range and over range when they do not meet the th 50 millivolts requirement of module's maximum or minimum output settings. The IC670ALG310 output module is compact in size and it can fit into small spaces. For input data, it takes 0 to 8 words of analog output data, 0 to 3 bytes of input data for the module and channel status, and 0 to 2 bytes of output data for clearing alarms. All of the data exchanges takes place between the output module and the bus interface unit. The IC670ALG310 output module comes with a "Channel Active" feature that lets the operators configure an individual channel as either active or inactive. The module also comes with local output default features that help to configure the data to the default settings or to zero for the module data in the bus interface unit. The module draws 170 milliamps of current from the bus interface. The resolution of the module is 14 bits and the magnitude data size is 14 bits.
1.1 Digital/analog signal difference The digital input/output signal is the switching signal, 1 or 0, Analog signals, there are two, voltage or current signals, generally the signal transmitted by the transmitter, such as the pressure transmitter to detect the pressure of the water pipe, it will output an analog signal 4-20mA or 0-10V signal to the PLC, PLC for data processing. The switching input point (DI) processes the switching input signal. Analog input point (AI), processing analog input signals (0-20mADC,0-5VDC). Resistance signal (including thermal resistance) input point, processing thermal resistance or general resistance signal. High-speed pulse input point, processing high-speed pulse signal. Voltage (including thermocouple) input point, processing voltage input or thermocouple signal. There is also communication, which is used to exchange data with the upper computer or control the instrument driver of the lower controller 1.2 Difference between digital and analog input modules According to the difference of field input signal, the input module can be divided into switching input module and analog input module. The function of the switching input module is to convert various switching signals into TTL standard signals required by the CPU. According to the input power supply type, it can be divided into DC input module and AC input module. The input signal is converted into TTL (5V) standard signal by photoelectric coupling after voltage division, current limiting and filtering. The function of the analog input module is to convert the continuously changing analog signals such as temperature, flow, current, voltage, etc. into several digital signals that the CPU can process. The analog input circuit is generally composed of op amp conversion, mode conversion (A/D), photoelectric isolation, etc. Types of PLC input and output modules: digital input DI, digital output DO, analog input AI, analog output AO. Digital input and output are generally 24V. There are 4 kinds of analog quantities in 2 categories, and the 2 categories are voltage type and current type respectively. Voltage type has 0-10V and -10 to 10V. Current type mainly has 4-20MA,0-20MA. Then the module converts the analog quantity into A number between +32767 and -32768 through A/D conversion, and then implements the control. The function of the signal template is to convert various process i/o signals. The input signals are converted into digital quantities, which are easy for plc to identify, process and analyze. The output is converted into analog to various regulating mechanisms for execution, or the output is converted into a 2-bit do quantity to control some devices such as start, stop, on and off
The communication module of the programmable controller is equivalent to the network interface in the local area network. The communication module data bus is connected to the PLC host, and the communication protocol is realized by hardware and software. The communication module of the programmable controller is generally provided with multiple interfaces, which can be selected through the selection switch on the communication module to realize the communication with other programmable controllers, intelligent control devices or computers. The input module is used to receive and collect input signals. There are two types of input signals: one is the switch input signal, which is provided by the button switch, the travel switch, the digital dip switch, the proximity switch, the photoelectric switch, the pressure relay, etc. The other is a continuously varying analog input signal sent by a potentiometer, thermoelectric meter, tonometer, motor, and various transmitters. The input module also needs to convert these different level signals into digital signals that the CPU can receive and process. The function of the output module is to receive the digital signal processed by the central processor and convert it into a signal that can be received by the field executive parts for controlling contactors, solenoid valves, regulating valves, speed regulating devices, etc. Another type of load control is the indicator light, digital display and alarm device.
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The main products are various modules/cards, controllers, touch screens, servo drivers
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