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Yes

Just an update: I used GX Config to change the settings in the "Ch1 Transmission Control and Others Monitor/Test" - Retransmission time - from 'Do Not Retransmit' to 'Retransmit' - Transmission Monitor Time (timer 2) - from 0708 to 0000 I still haven't found/fixed the problem, but this has stopped the card from disconnecting and going into error.

This may or may not be related, but the serial com. card gave an warning earlier which it has not done before 7F42 - Transmit watchdog timer (timer 2) time-out occurred - Check if DTR control, etc. interrupted transmission The info about the card in system monitor did not disappear this time... Could there possibly be any relation?

I installed a new backplane and a new expansion cable this morning. The module 'disconnected' within an hour... The presence of the card seems to be detected... but information about the card and transmitted data seems to be lost. I wonder what else could cause this... thanks

The card is not physically disconnecting. The LED display list on the card stays lit and displays no error. There is no indication of an error with this current card... However the previous card gave an error 1414. There is no vibration. The card is screwed into the backplane.

No and Yes. I do not have access to another Backplane yet. I moved the card over to the next slot and the same problem occurred. So far, we have: Replaced the QJ71C24N card Changed card slots Replaced the CPU Thanks in advance.

I have a serial communication card (QJ71C24N) that seems to be disconnecting. Periodically, my laser-marker will stop receiving data from the communication card. When the problem occurs, I check the system monitor via GX Dev. and it says the module has been disconnected. Replacing the card has not helped. Has anyone seen this or can anyone offer any advice while I troubleshoot it? Thanks QJ71OK.bmp QJ71NG.bmp

Update from yesterday evening: I left the original programming for the original 3 channels in the program and deleted the programming for the new channel that I added. I then used ConfigAD to set up the new channel only. Same results as before- it worked well until the power was cycled. I am still slightly confused as to why it will not work with TO and FROM commands only. Also, is there something I need to do as far as making the intelligent module parameters load after the power is cycled? Thanks again.

The original 3 sensors are wired and configured for voltage. The new sensor is wired and configured for current. Switch 1 settings are [0222] in the parameters. I did add a TO and FROM command in the ladder logic similar to the original/example program. Yes, I left it in the program after using the Config AD tool. When I have a moment, I will remove the TO and FROM commands and let you know the results. Thanks.

I am installing a new analog sensor into an existing Q64AD module that came with the machine. There were already 3 analog sensors installed that came with the machine. After physically installing the sensor and programming the PLC similarly to the original programming* for the original 3 analog sensors, converting the changes and also writing the program to the PLC, the new sensor's data would not be read by the PLC. It only displayed '0' in monitor mode when moving the sensor. * The programming is very similar to the example in the Q64AD manual I then used GX Configurator-AD to set parameters for the module**. I setup the Initial Settings and Auto Refresh, saved the parameters, remote stopped the PLC, and wrote those parameters to the PLC. After I put the PLC back into RUN, the sensor's data could then be read in Monitor Mode. ** There was a warning that said the conditions to create an FB were not ready, the FB conversion could not be used. After cycling the power to the PLC and going back into monitor mode, the sensor data went back to always reading 0. Please let me know if you need more details. I would be grateful for any help. Thanks in advance.