two. System Introduction The system is realized by human-machine interface, PLC and temperature control table as follows:
Figure 1, system diagram.
three. system introduction
1. PLC selects SPB30 host plus 16 input/output extensions. A total of 46 points (30 in/24 out) meets general needs. Price 2100 yuan. Has the following characteristics:
(1) Has a variety of 32-bit arithmetic instructions;
(2) 40 points, 60 points with internal clock;
(3) Has floating-point arithmetic function and corresponding trigonometric function;
(4) With PWM and other pulse control functions;
(5) Multi-stage ramp hold control function;
(6) With functions such as matrix, PID, digital switch reading, etc.;
2. The man-machine interface selects Fuji new generation man-machine interface UG221H-LE4. This machine integrates control, communication, data processing and man-machine interface, and has the following features:
It can directly communicate with more than 100 kinds of PLCs from nearly 30 manufacturers such as Fuji Mitsubishi Omron Panasonic Siemens AB GE;
Can communicate directly with computers, microcontrollers, etc.; with printer interface (parallel / serial);
Can directly connect Fuji G11 P11 E11 and 6000V high-voltage frequency converter, a POD can communicate with multiple frequency converters at the same time;
Multiple connections can be made, one POD can bring multiple PLCs, one PLC can bring multiple PODs, and one POD can communicate with PLCs of different manufacturers at the same time (currently FUJI, OMRON, Mitsubishi, Sharp);
Can directly connect the temperature control table, can connect up to 31 units;
Through the POD can be directly on the computer to the Mitsubishi PLC / download, monitoring, no plug, easy to debug;
Powerful network, can be linked to Ethernet, PROFBUS-DP, CC-LINK, T-LINK, SX bus, etc., and can communicate with any device with MODBUS function;
With 32-bit RISC CPU, communication speed up to 115200bps;
The development software is powerful and can be freely developed and customized, and it is easy to use.
Adapt to industrial site environment, high reliability, front panel waterproof rating IP65;
With screen protection, floating-point operations, four-level password function, can be connected to the camera;
It can be programmed and debugged online, without plugging and unplugging, with simulation function, without PLC can debug the program, quickly modify the screen;
3. PXR4 Thermostat This machine has the following features:
Can fully replace AO/AI module with data display. The input/output can be arbitrarily selected among thermocouples, PT1OO, 4-20MA. PID control is implemented by itself. Excluding editing and debugging staff work hard. Parameters can be set in both POD or PXR. The price is 1 in / 1 out, 800 yuan / Taiwan. And there is corresponding alarm and control output on the temperature control table.
three. Conclusion For a large number of developers using AI/AO modules, using a temperature control meter to achieve the corresponding functionality is really a pleasure. For small PLCs, multi-channel analog is best implemented with PXR. Because each individual setting or group setting can be conveniently implemented, corresponding parameters can also be displayed on the POD in a centralized manner.
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