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New Project (New with S7)

Created by: G-Hawk at: 9/28/2008 8:02 PM (4 Replies)

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9/28/2008 8:02 PM	Rate (0)
G-Hawk Posts: 7 Rating: (0)	Hi guys, I'm new in the forum, but I hope you can help me. I'm changing the control of one machine which uses Octagon boards to aSiemens S7-200 PLC (6ES72162AD230XB0). Because of that I have plenty of questions. a) Octagon uses Isolation boards for Input (Sensors) and Output (Pneumatic Valves). I'm wondering if I'm going to still need them, because they are quite big, and as far as I know the PLC is already isolated, I'm I right? b) I'm goign to control 4 motors in 2 steps. First I'm moving 3 and then I'm moving the lastone. I got an EM253 position module. The question is if that's enough, i mean I can do all with one module? (I hope that I can) c) Back to the motors, they are Vexta Step Motors and have their own drivers, and I just need them to move some distance, always the same distance. So to do that is necesary to use a position module, can be posible to do the controlin other way? d) I'm going to use a TP070 Touch Panel. Once connected I need to make a setup to show programs or is automatic?... all the programs are loaded directly to the Touch Panel?... Is necessary to make some programming to display critical steps in the panel?... e) Regarding the software. I need to do some parallel programing, I mean that I need to make 2 or 3 different programs and all need to work at thet same time, can that be possible?.... Which languaje is best to do that.. LAD, SCL, GRAPH...?, Can LAD do it?.... I will apreciate if you can help me with all these questions... Regards!
G-Hawk Posts: 7 Rating: (0)
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9/28/2008 10:21 PM	Rate (0)
legacy support Silver Member Joined: 7/15/2008 Last visit: 3/13/2025 Posts: 382 Rating: (44)	Hello G-Hawk It seems to me that you have allready thought about what you like to do , and the steps to finish the conversion from a PC based ( Octagon ) to a PLC based Machine. a.) The 226 has 24VDC inputs . If your Machineuses24VDC Proximety Switches or Switches with Dry Contacts you are fine . The Outputs on thethe otherHand I would recomend a Isolation Board depending onthe load. b.)please see http://support.automation.siemens.com/WW/view/en/31095097 and http://support.automation.siemens.com/WW/view/en/1109582 c.) Depending on the Series of VEXA you have . Alpha Step / RK 5-Phase / UMK 2-Pase . But I would use their Driver Boards. d.) TP070 is discontiniued , but still a very good Panel to use for a small Machine . I you have MicroWin / TP Desinger you can develop Screens depending on your Customers / Machine requirements. e.) S7 200 / 226can be programmed in LAD and has also a Libary of Function you can use to create a multi level Program. The Help Files and the Example Programs that come with Step7 Micowin are vey good . There are also Example Programs on the Siemens Web. A good sugestion would be to attend a Course for S7 200. Regards

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9/29/2008 3:04 AM	Rate (0)
marcsinclair Posts: 49 Rating: (5)	Hi, Although PLCs share the electronic architecture of (single board) computers, they are not normally programmed as Von Neumann cycle machines. That is, the program is not run as a list of instruction - data - address commands, but as a read the inputs, evaluate the program, set the outputs cycle. so parallel processing has little meaning here, in the conventional sense, as everything is done at once! This programming method is intentional, and is supposed to mimic relay logic, which is what it was designed to replaced. Having said that, immediate commands, and interrupts have blurred this distinction a little and were important while available processing power was low. For your project you will need to understand the plc cycle, and understand the functionality of the modules. I have used the stepper module, but if your drives can accept simple step and direction signals you may be able to use the built in pulse output functions of the PLC. Rather than the TP070, look at the TP177 micro, it's a much better touch screen (and it runs linux ;) If you are used to the absolute control and raw speed that machine language gives you, you will be disappointed with PLC programming, but if you need standard robust hardware with simple programming and development, then Siemens is certainly among the best in the world. If you are a programmer, then use the IEC version of the language displayed as FBD. It is strongly typed and you will appreciate the overloaded instruction capability. You can also save parametrised subroutines to a library to reuse code. After that the rules are, work logically, read the manuals (you will find that Siemens documentation is excellent), comment everything, make sure that you understand the mandated codes for your area (CE, UL etc.) and of course - have fun.
marcsinclair Posts: 49 Rating: (5)	Last edited by: marcsinclair at: 9/29/2008 3:27 AM forum went down during upload, and mangled the formatting
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9/30/2008 9:28 AM	Rate (0)
Helmut_13 Posts: 2930 Rating: (432)	Hi, to control 4 stepper you need a drive for each stepper and there are two possibilities to control each seperate. 1. Use a 24 V DC/DC/DC-version of aS7-200 PLC. Two stepper motors you can control with the integrated onboard pulse outpots (Q0.0 and Q0.1). You stepper drive must support pulse/direction interface. The left two stepper drives you can control via two EM253. A EM253 only supports one stepper dirve. 2. Use two S7-200 PLC's (24V DC versions) each of them can control two stepper with the onboard pulse outputs. For the data excahnge between the PLC's you can use a PPI-network (NETR/NETW-wizard). This is almost cheaper then to use two EM253. For programming you can use the "position control wizard" which is part of Micro/WIN or you can use the MAP_SERV Library. Here the link for a free download: http://support.automation.siemens.com/WW/view/de/26513850 The MAP_SERV Lib supports PLC open similar instructions to control the drives. I hpoe this helps Regards Helmut
Helmut_13 Posts: 2930 Rating: (432)
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10/4/2008 4:07 AM	Rate (0)
G-Hawk Posts: 7 Rating: (0)	Thank you very much for your support, to all of you... everything you just share to me is a very good information and I appreciate that. I'm just wondering if somebody could give more information regarding thetouch PanelTP070 regards!
G-Hawk Posts: 7 Rating: (0)	Last edited by: G-Hawk at: 10/4/2008 4:11 AM
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