Siemens 1200 connection with incremental encoder
1, Siemens 1200 and incremental encoder connection Siemens 1200 digital input switch points provide fast counter function of incremental encoder pulse signal, single-phase signal up to 200KHz, bi-phase signal (can be quadrupled and determine the direction) to 80KHz, for commonly used 2500PPR (resolved per revolution The number of pulses), the fastest speed reaches 1920RPM (revolutions per minute). The signal of the incremental encoder is a PNP one-way open circuit signal. The recommended incremental encoder is a 10-30V push-pull output type, such as the GI58N incremental encoder. 2,Siemens 1200 and absolute encoder 4-20mA signal connection Absolute encoder signal is not afraid of interference, power failure data will not be lost, PLC does not need to count time for absolute encoder, no need to calculate interrupt time for CPU scan and save CPU resources, especially the market price of absolute encoder is greatly reduced. At the same time, due to the improvement of data reliability, the use of absolute encoders can save commissioning time and reduce after-sales service costs. The actual use results and cost-effectiveness are far better than the selection of incremental encoders. Many users tend to use absolute encoders. Due to the economical nature of the Siemens 1200, it is more economical and convenient to connect the 4-20mA signal interface with the absolute value encoder. The Siemens 1200 comes with two 4-20mA input interfaces and can directly connect two with 4-20mA output. The absolute encoder of the interface. The absolute encoder is divided into single-turn absolute value and multi-turn absolute value. The single-turn absolute encoder means that the encoder rotates within 360 degrees or works within 0-180 degrees. The selected encoder is 4mA corresponding to 0 degree. , 360 degrees (or 180 degrees) corresponds to 20mA, the data in the PLC linear corresponding to the angle value, each value corresponds to a unique angle value, the data does not rely on counting, not afraid of interference and power outage, can be directly used in programming. The single-turn absolute encoder is recommended to use GMS412.LB (code 9400S). The encoder can set 20mA corresponding angle value and rotation direction and zero offset. For example, it can set 20mA to 180 degrees and the encoder works at 0- 180 degrees. In the PLC positioning control of length or height, often need to rotate the encoder over 360 degrees of the working range, you need to select a multi-turn absolute encoder, multi-turn absolute encoder 4-20mA output has two types, one It is a fixed range multi-turn absolute value, for example, 16 laps, 64 laps, 256 laps, that is, the corresponding value of 20 mA is 16 lap end points, 64 laps or 256 laps. Such encoders are economical, and the recommended model is GEX60.LB; One is an intelligent multi-turn absolute encoder, 20mA can be set anywhere in the middle of 1-4096 cycles, and zero offset can be set. The recommended model is GAX60.LB (code 9600), this encoder application It is extremely extensive and has been successfully applied in many fields such as lifting, water conservancy, military industry, petroleum, chemical engineering, and various industrial machinery. 3,Siemens 1200 and absolute encoder RS485 or Modbus RTU signal connection Siemens 1200 can be configured to communicate RS485 interface, the interface can be connected to the absolute encoder RS485 signal, including single-turn absolute and multi-turn absolute value, absolute encoder RS485 signal in many forms, more commonly used simple RS485 Broadcast mode (master station active broadcast transmission), free protocol with address sent by the command (slave passive mode), Modbus RTU mode, etc., where if only one absolute encoder is connected, the encoder active mode is available, the protocol is simple The signal is reliable, and if multiple encoders (Bus mode) are to be connected, the Modbus Rtu mode can be selected, but because of polling, each encoder returns slower data refresh and is not suitable for fast moving control. The recommended active mode RS485 encoder is GES38.RDB or GMS412.LB (code 9400S) for single-turn absolute models; GEX60.LB (64 cycles) for multi-turn absolute models, or GAX60 .LB (Code 9600) (4096 cycles) Recommended passive command mode RS485 encoder (1-9 encoders can be connected, including address), single ring absolute value model GMS412.LB (code 9400S); multi-turn absolute value model GEX60.LB (64 cycles ), or GAX60.LB (code 9600) (4096 cycles). The recommended Modbus RTU mode encoder is GMS412.RMB for single-turn absolute models and GAX60.RMB (4096 cycles) for multi-turn absolute models. 4,Siemens 1200 and absolute encoder Profibus-DP signal connection Siemens 1200 can be configured Profibus-DP bus communication interface, this interface is the most commonly used output mode of the European absolute encoder, can choose a variety of European import brand encoders, including the domestic brand absolute encoder, the interface is Siemens Commonly used interfaces, but the cost of the interface encoder is high, including the cost of configuring cable wiring is high, and it is not suitable for the economy of 1200, and is not recommended here. 5, practical case, Siemens 1200 and absolute encoder 4-20mA signal connection, do a simple positioning control Practical application introduction: Single and multi-machine control of hydraulic gate height, lifting height of flood prevention, storage regulation, water supply, and sewage discharge, etc. across the country, hoisted and closed by hoisting crane (lift), each gate station 1-6 gate hoists, Siemens 1200PLC connected to 4-20mA absolute multi-turn encoder interface, configuration HMI, can be a very good and effective completion of such a simple positioning control. The encoder can be mounted on the winding shaft connection of the winch or the connection of the reduction gear shaft. The number of rotations of the encoder is calculated in advance. The 20 mA output of the encoder is set greater than the value of the circle, for example, 16 turns, so that the output of the encoder Each 1mA linear change of 4-20mA corresponds to one rotation of the reel to calculate the height change of the gate lift to control the opening and closing height of the sluice gate. The selected encoder model is the above-mentioned recommended GAX60.LB (code number 9600). The project is applied to a number of sluice gates in the northeastern Harbin, Changzhou, Jiangsu and other places. Practical application introduction 2: The hydraulic dual-cylinder lifts the synchronous control. The larger sluice gate needs to use the left and right two hydraulic cylinders to power up and keep the position synchronous to ensure the smooth lifting and lowering of the gate. The original gate opening meter of a sluice gate in Guangdong is only used for display. Because the reliability of the original display meter is low and the hydraulic cylinder synchronous rectification and lifting control cannot be completed, the user hopes to use a small-scale economical PLC and HMI to replace the original meter only for display. , to improve the control reliability and programmable controllability, PLC chose Siemens 1200, the encoder used an absolute multi-turn encoder 4-20mA signal interface, GAX60.LB (code 9600) 2, respectively, with mechanical installation and Corresponding to the lift height of the two cylinders, the corresponding cylinder height is set to 6m corresponding to 20mA, two 4-20mA signals are connected to the 1200 analog interface, and the PLC is compared with the two sets of data. The electromagnetic valve of the left and right hydraulic cylinders is controlled according to the height difference. , Adjust the flow of hydraulic fluid to the left and right, to adjust the speed of the cylinder to increase or decrease and the position difference, to maintain the synchronization control of the two cylinders lift control. Siemens 1200 PLC supporting two absolute encoder 4-20mA interface, well completed such synchronization correction and lifting control. The CAT6A 10Gig UTP modular jacks provide transmission performance beyond 500MHz and Alien Crosstalk requirements exceeding the industry standards set by ANSI/TIA-568-C.2 for supporting the operation of 10Gig Ethernet applications (10GBASE-T). It is designed with a shielded termination cap which minimizes additional AXT from neighboring connectors. It also features twisted pair separation posts which minimize the untwisting of pairs to allow for efficient installation and long-term peak performance. The modular jacks are also backward compatible supporting current CAT6, CAT5e, and voice network applications. CAT6A Keystone Jack,Keystone Jack CAT6A,Cat6a Jack,Keystone 6a NINGBO UONICORE ELECTRONICS CO., LTD , https://www.uonicore.com