Search the Community

I am trying to connect a Panel PC (Bartec RS-422) and an Omron PLC (CJ2H RS-232) I am using a Kinematics 2199 RS232 to RS422 converter. Results: Testing software Multiway v9.5 1) Using a usb to rs-232 cable on another PC - I am able to send and receive a hostlink commands between the panel rs-422 converter and the PC rs-232. commands come through correctly 2) Using the PC to connect to the PLC - If I connect directly to the PLC using the usb to serial cable and a short adapter I made to map the Omron PLC pin out 2-2,3-3, 5-9, I can send and receive hostlink commands to the PLC. Everything works as expected 3) Using the Panel and the USB Cable - If I connect the usb converter to the Panel I am also able to communicate with the PLC 4) using the RS-422 port on the Panel - If I connect the panel RS-422 port and converter and then connect to the PLC. I can only send commands; I cannot get any responses come through from the PLC. My converter box has LEDs on the RX and TX channels and I can see the PLC tries to send something. But something must be corrupted as multiway does not show and response. I have tried a bunch of things but I am at a loss on how to diagnose this issue. Since I can get the two PCs talking to each other sending and receiving, I can rule out any wiring issue between the converter box and Panel. Since I can plug the USB into the Panel and get it to work correctly, I can rule out any operating system issues and PLC configuration issues. The only link I cannot verify is that from the converter box to the PLC, I am not sure if the PLC can push hostlink data that has not been requested. I have no idea why I can write to the PLC but not read. If anyone can provide any insights, I would greatly appreciate it, It has been two days and I am stuck. I am looking at maybe getting a logic analyzer to try and see what the PLC is sending back, but that will be months away. I am happy to try any suggestions

Hello, I am using Hostlink protocol to read data from PLC units. for example @00RD22220001..., will return DM2222's value. But I want to know, if I could read multiple DM values at the same time. for example: DM2222, DM3000, DM4000, reading these DMs with one communication. Please note that these are not continuous DM areas. I know a sequence of DMs can be read by specifying starting address and count. Many thanks in advance. Ting

HI all, I have connected my CJ2M-CPU13 to Advanced HMI software via Hostlink (19200,7,2,E ) . I connected to the serial port in CPU and just used ( didnt write any code or formating). The HMI response is very slow ( almost 2+seconds). I am not sure whats is wrong, Is it because i am using more words? Anybody had this encountered this problem? Appreciate all suggestions and advices.

I am doing a data collection from OMRON PLC CP1L through MS excel VBA use API function. The connection was setuped correct (I think)both in PLC and PC side. The trick things is when PLC have USB cable connected the data was send to PLC and can get feedback through RS232 in normal.(I use portmon moniter the progress,and I can see the data (C-command ).But when I get the USB cable removed ,The PLC can not get any reponse back.Dose any of you have met that before?