electronic products in the current market, many dazzling PLC products, there are some old old and famous, like Siemens and Mitsubishi, AB, etc., there are some emerging new products, as manufacturers different structure in the specific products and network software programming functions are there differences between students in our school lab has been using since 1992, the United States AB s PLC-5 family of products, mainly SLC500 series, including SLC5/01, 5 / 02, 5 / 03 in three models, respectively, input and output modules with 8 points, 16 points and 20 points, also a small number of 30 points and 40 points in the I / O used for laboratory development, of more than a year, PLC has been committed to trial and a number of development projects on the AB s SLC500 series of product development and use of accumulated some experience, given the current article describes the use of this product not much to write this article, together with colleagues discussion.
1, Company is the U.S. production of AB PLC of the major manufacturers. 90 years of the company s PC sales account for the total U.S. PC sales in the domestic market for more than half. The company offers all types of PC, to accommodate from single large factory automation control to the different needs of production SLC500 PLC-5 family includes models such as three small PC and PLC-5/10 medium such as PC-8 type. This series of processors have similar features and has a typical upward compatibility with the common functions in addition to instruction, also has a sequential function diagram (SFC> structure programming and PID instruction.
2, Ladder programming software, APS has provided the use AB programming software, APS, access to the software implementation of the APS. BAT, the main menu screen can appear, respectively, show a total of 10 F1-F10 function menu, press a different F key, the corresponding optional feature. Programming is divided into online programming and off-line programming, the general use of money from the program for the first, and then prior to debug. Steps to: Select F4 (OFFLINE CONFIG), there has to exist. HEX file, if you want to edit or execute these files, press the cursor up and down keys to select the file, then the paper was anti-white, then F3 (SELECT FILE), then press F8 (ACCEPT), press F3 (OFFLINE PRG / DOC), then the lower right of the screen shows that you want to edit the file name FILE: 9797; while the bottom screen appears the Edit menu (F7-F8>, then press the F8 (MONEOR FILE> can enter the Edit menu next level, the framework appears ladder (from bottom to top, both from (END> Start>, then select F10 (EDIT> to enter the next level of the Edit menu (F3-F9>, the meaning of the function keys are:
F3 (APPEND RUNG): insert a space between two lines of logic line:
F4 (INSERT RUNG): above the line in this logic into a logical line:
F5 (MODIFY RUNG): Edit the logical line, including logical bit instruction <BIT>, Timer / Counter (TIMER / COUNTER), more instructions (COMPARE), arithmetic instructions (MATHL shift Series also instructions (MOVULOGIC), File command ( FILE, sequential order (SHIFT / SEQNCER) control orders (CONTROL>, special instructions (SPECIAL), the use of specific instructions see the SLC500 instruction set:
F6 (DEIZTE RUNG): Delete the logical line:
F7 (UNDELETE RUNG): recover deleted the line:
F8 (ADVANCED EDITING): Senior Editor:
F9 (TEST EDITS): Editing Test:
After you finish editing a logical line, press the ESC key to exit, then F10 (ACCEPT RUNGL then continue to the next line editing.
If the need to generate a new one. HEX file, select F4 (OFFLINE CONFIG> after the election F6 (CREATE FILE), and then to choose and you are operating the same PROCESSOR PLC processor type, generally there is marked on the device, this step initially more critical writer Because not given attention, choose the wrong model, then the specific editorial ladder, the screen always suggest I / O point address of an error, took a very long time to find the origins of mistakes. selected processors, by mouth, At this point you have selected PROCESSOR name will appear in the CREATE PROCESSOR FILE file box, and then F8 (ACCEPT> Exit, then select the file just now emerging, according to the method of editing.
3, the network features network link SLC500 series PLC using DH-485 data link, which has the following features:
32 devices connected; multi-master function; token (TOKEN> pass access control: continuous increase or remove the link node function: the maximum link length of 4000 ft DH-485 data link to "daisy chain "The form of the various links connected to each PLC coupling device, and then link couplers and programming through the contact points, a typical connection diagram above:
DH-485 can support the data link equipment SLC500Include:
SIC500 fixed I / O controller (transponder>; SLC5/01 modular controller (transponder>; can run SLC500 Advanced Programming Software for personal computers (starting device>: SLC-5/02 modular I / O controller (initiator)
4, the bus is more than personal experience of, SLC500 series PLC s application there are many aspects worth studying.