Emil
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Posts posted by Emil
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Hi to all!
M91, as it is, cannot be connected direct ot Ethernet. The same is for V120. You can try ot use any serial to Ethernet converter, but my feeling is thhat it will be more expensive than the PLC itself.
Important note - now Jazz 2 has Ethernet adds-on module MJ20-ET1. With it, you can "see" the controller via U90Ladder and other Unitronics software tools or to communicate Modbus IP.
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UniCAN can transfer 32bit at one package. In this matter you're right. But there is no problem to send thhe data in several packages. It will be slower, but if you transfer analog values, which don't change so fast, it will be more than good enough.
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Two notes:
1. "Limitation" CANNOT be metioned in any documentation, as it depends on many factors. This number comes from limitation in communication between PLC and EX-A2X. As Yair stated in his post above, in bottom line of Hardware configuraiton window (VisiLogic) there is a "calculator" of communication load. Any one can check before starting to build his project.
2. In fact, there is no such limitation! You can add Remote adapters EX-RC1. To each adaprer you can connect, let's say 6 x IO-ATC8 = 48 universal 14 bit AI. You can connect up to 60 x EX-RC1 to one PLC. This means - 60 x 48 (via RC1) + 48 (on A2X). In my calculator the number is 2928. You can add another few analog I/O on board or Snap In module, but this will not change the final situaiton drastically.
BTW - having 6 x ATC8/AI8 ot each adapter, you can still add up to 2 more I/O modules with digital I/O...
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SB80 is like a switch to perform the calculations. You need to SET it with one scan condition each time you need ot perform the linearization math. Before SET it, you need ot take care to store X value in SI84 and next net after SET SB80 - to store tghe result from SI85 to any MI. If Linearization points X1, X2, Y1 and Y2 are the same for both (or more) Linearizations, you can store relevant values in SI80-83 with Power up condition. If not, you need ot make the "snake" net before each calculation.
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Please check the example "Linearization of two inputs" in U90Ladder > Help menu > Sample... > Flow and totalazing...
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Copy memory and Struct are different functions. You define the thhings in different way and, according to the definition, you can receive different results.
Can you send mail ot support@unitronics.com with some example what exactly you did? In my understanding, Copy Memory needs ot be the simplest way ot acheive your goal. I want to see how you define both modulles and why you get different results.
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It's even easy and right ot use Copy memory (VisiLogic > Vectorm menu > Use ofset).
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Yes, connecting controller via Ethernet to Cellular router is like connecting it to cable Ethernet. In some cases (depends on routher and network) it's even faster and more stable.
Two modems - out of elegancy of this solution, which I'm a little in doubts, I'm not sure if the contfroller can handle such configuration. Again - because of elegancy, we never tried it.
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No. On GPRS you have only one communication channel. Theoretically, you can switch between Modbus and PCOM once established GPRS connection. But this means that you will have only part time connection between SCADA and PLC and it will be difficult to synchronize between controllers themselfs.
Idea - use cellular router instead GPRS modem. It will let you to open 4 communication channels. While one port will be opened for the SCADA, with other ports you can communicate Modbus Master Slave or even better TCP or UDP Raw.
If you are interested in such solution, I can give you some more info.
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Theoretically yes. But you need ot implement PCOM Master in one of them. You have a very good description of PCOM in our site and I guess you can accomplish the task in 2-3 weeks. Compared with Modbus, where the programming can take 2-3 hours...
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Reset alarm even without you see it?
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Hi,
First - Modbus is communication protocol. The question "Which cable to use with Modbus" seems to me like "Which kind of fuel to fill in my horse?"
Let's assume Modbus is running on RS485. In this case the question needs to be "Which cable to use for RS485"
... and the answer is:
Shielded twisted pair with impedance between 100 and 120 ohms.
Some producers offer special cables for RS485, which, of course is the best.
Some recommended cables in attachment.
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As you show in the capture, it needs ot work. Please send the application to support@unitronics.com and we will check it here.
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Hi Martinas,
In FB PWM cycle time is given in ticks of 2.5 ms. There is no theoretical limit for number of ticks and this way - the sycle time. For example - you can srt cycle time 4000 ticks of 2.5 ms, wich means it will be 10 seconds. You can drive any digital output from FB PWM, including relay.
I hope thhis answers your quesiton.
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Just small note - despite CS32 is Unitronics part number, this is the standard modem supplied with Sierra Wierless modem. I guess its pin out can be found in SW site...
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Hi Paul,
The min frequency is 5 Hz. We will take care to update Help topic.
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There is UDP Raw example set among standard examples in VisiLogic...
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Please contact me with e-mail to support@unitronics.com with some details of your application and the problem you face. I'll make my best to help you ASAP.
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You can define up to 6 numbers in SMS phone book. One (and only one) of them can be defined as Indirect.
When you define a mesaage to send, when you click on "S" column to define the bit to send, U90Ladder opens Phone book and you can "Check" in left column the phone numbers you want specified SMS to be sent.
a) If you check only +1234... it will send only ot it.
If you check only te indirect number, it will send only to it. BTW - you can make relativelly simple Laddewr logic to fill different numberts in stated MI addresses and this wasy to send to many numbers.c) to both - if you will check both +123... and the indirect number.
d) to neighter of those numbers, if you will not "check" any of them.
I hope this answers the question.
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Please note that there can be conflict between two protocols which can mess te communication with one of them or both.
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Please send screen capture of the error + data of your PC (Windows version, service pack, RAM, processor...) and U90Ladder version you're trying to install to support@unitronics.com. Pleasse explain when and how this message appear.
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Hi Nouy,
If you know the command, you need to set the port to FB Protocol and send the command via Protocol send block. You need ot prepare FB Protocol Scan block to receive expected answer.
After receiving the answer, you need ot return the port back to modem operation.
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We are checking. Hope soon will be some reply...
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Hi Aus,
Definitelly - you can use V230 without Snap In module!
You can use it without any I/O at all - just as inteligent HMI, communication center and/or Data Logger.
You can add to it Snap In module only.
You can connect Expansion modules only - without Snap In.
You can connect and use both - Snap In AND Exapnsion modules.
All these options are fully legal and it's a matter of project needs and ... personal preferences!
If you check only te indirect number, it will send only to it. BTW - you can make relativelly simple Laddewr logic to fill different numberts in stated MI addresses and this wasy to send to many numbers.
Fan Control
in Vision & Samba PLC + HMI Controllers & VisiLogic Software
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Instead timer, maybe you can try ot set a little hysteresis. Please check the example ON-off control in VisiLogic.
I'll divide the conditions to start and stop the fan for both temperature and humidity setpoints and they both will operate bits. Then will OR these bits to activate the real output. This seems to me easy for edit and debug.