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I currently have a V570 installed at a site that is logging trend data. Currently it is logging five curves, but my customer has requested a sixth value he would like to trend. This is a pumping application with a flow meter, and he would like to trend total flow through a pipe. The problem is that it is a large pump, and therefore a very large value (in gallons). The controller displays this value on one of the HMI screens. It is large enough that I had to assign it on an MF. The curve properties of the trend feature only allows me to choose an MI as a data operand. Is there a way to do this with an MF? Thank you.

Thank you. I will give this a try.

I need to set up communication between a V130-33-R34 controller and a Zoom land-line modem. I will be using an RJ11 com port on the PLC, set to RS232. The modem, unfortunately, is an older-style, and has a D-SUB 25-pin com port. I will need to build a cable to connect between the two devices. I found a D-SUB 25 RS232 pin-out arrangement online. Data communications is new to me, so I have a pretty basic question: Do I simply need to match the 6 signals on the PLC RJ11 port to the corresponding pins on the modem's cable? For example, does pin # 1 on the PLC (DTR Signal) get connected with pin #20 on the D-SUB, which, according the pin-out I found online, is also DTR? Following this logic, the two 0V reference pins on the PLC would be connected to the two GND pins on the modem, TXD to TXD, etc. Is this correct?

Thank you. This seems like the proper way to accomplish this.

Thank you, Saragani, I will get my customer to try that.

On a trend graph, pressing the "M" button allows the operator to scroll through trend history using the automatically-appearing scroll arrow buttons. But after stopping and re-starting the trending, the PLC seems to erase the previous trend data. I know that when saving to an SD card, stopping and starting the trending begins a new file. Is there a way to scroll back through the previous trend file on the graph even after a new trending "session" has begun?

I have a customer who is unable to use the SD Card Manager to access the trend data on his SD Card. He emailed me the .UTR file, and I was able to access the data by saving the file on my computer, and using "Import SD Folder". I navigated to the .UTR file location on my computer and although I was greeted by a message saying something like, "Unable to Access Data: File may not contain any data samples", after clicking OK on this message dialog, the software not only automatically displayed the data, but seemed to automatically create an Excel file as well. This was handy, I suppose, since I wanted an Excel file, but I assumed I would first have to display the data in the SD Card Manager, then use Export to Excel in order to view the data in Excel. Regardless, the data is there and appears accurate. Onto the main the topic: My customer has not been able to reproduce what I described above. When he opens the software, the "Import SD Folder" icon is greyed out. I assumed that he needed to create a new project first. When he presses "New", the "New SD Data Project" dialog appears, in which he needs to give the project a name, and then choose a location to save the project. However, he is stuck at this step. Regardless of where he tries to save the project (desktop, etc.), he is met with a message saying, "Access to path...denied". It's as though the software thinks he's trying to save the project in a restricted location. He claims that his office network does not have strict security in place. I got him to try uninstalling, then re-installing the SD Suite software, but that didn't work. Has anyone encountered this problem? Thank you.

I programmed a JZ20-R16 for a customer. The program includes five timers, settable via the keypad using Variables. I'm surprised I did not notice this during testing, but the PLC is now on site and my customer claims that each time he cycles power to the PLC, the timer values reset to zero and must be re-entered by the operator. This is not ideal for this application, as power is cycled often. Most of my experience is with the VisiLogic software, which simply has a tick-box in the Operands section next to timer values, enabled the PLC to "remember" the setting. The M90 software does not have this tick-box. Is there another way to have the PLC retain the timer values? As a side note: The PLC my customer is using is a demo-unit obtained by a distributor in his area. He is not familiar with the hardware and has been unable to confirm whether the unit contains a battery. Is the battery integral to this timer retention? Thank you.