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Messages - ccdubs

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61
Technical support / Re:SEND EMAIL WITH XSERVER
« on: April 19, 2009, 12:45:27 PM »
If your PLC scan time is less than 1/2 second you will end up calling your email routine more than once as r1 would not be reset due to the time condition still being true.

I have done the same thing and have had to use a "flag" to indentify that the routine has run. Alternatively you can change the scan time or delay in the email routine if your application allows it.

62
Technical support / Re:Corrupt EEPROM
« on: March 09, 2009, 03:13:48 PM »
It sounds like your vibration issue may be low frequency/high impact if you are breaking components off. This would be quite hard to mitigate.

Supports post regarding the undervoltage cutout circuit is a good one also. I have had to implement this when running from battery backed up supplies which can cause constant rebooting of the PLC as the battery dies. After a while the PLC doesn't like this anymore. You could be seeing something similar every time the car is started.

63
Technical support / Re:Corrupt EEPROM
« on: March 09, 2009, 12:35:19 PM »
It sounds like our problem is quite different to yours. I would suggest a DC to DC converter is a good first step as driving directly off the car 12V supply is almost always a no-no.

I would have thought it quite easy to get something specifically designed for automobile use.

64
Technical support / Re:Corrupt EEPROM
« on: March 09, 2009, 11:50:27 AM »
BenB2000,

I have also had some issues where EEPROM was originally to blame and it was later found to be something else.

How do you know for certain that the problem is EEPROM? Do repaired units repeatedly fail? Do you replace the EEPROM or just reprogram?

65
Technical support / Re:Auto 485 - disconnection problems
« on: January 18, 2009, 10:47:25 AM »
It would appear that it is the Auto485 as I was able to monitor with the same USB converter on com1. Interestingly though the MODBUS coms through the Auto485 still worked but there is no easy way for me to determine how reliably.

This isn't the first time I have had this problem so I will focus on the Auto485 as the problem.

66
Technical support / Latest Versions
« on: January 17, 2009, 03:02:43 PM »
Hi support,

Do you keep a log of latest firmware versions and PCB revisions somewhere for users to check?

I just received a T100MD 2424 from my supplier and the box was covered in dust and I would like to know if I have an upto date unit. The detail is: Board Rev D-1, Serial 0403008

67
Technical support / Re:Auto 485 - disconnection problems
« on: January 17, 2009, 02:59:18 PM »
It appears that it must be the Auto485 as the comms still failed even with a blank program.

I will try again with a direct serial connection from my PC to the auto485 when I load TLserver onto it, just in case the problem is coming from the USB to serial converters (I have had issues with these in the past).

Will let you know.

68
Technical support / Auto 485 - disconnection problems
« on: January 14, 2009, 11:02:30 AM »
Hi all,

I use an Auto 485 to connect to my T100MD888 plc for downloading and monitoring purposes while at the same time I connect my PC to the RS232 com port of the PLC for MODBUS comms generated by DAQFactory.

This is allows me to online monitor while the PC and PLC comms are active, which is great for development and debugging. Unfortunately the 485 coms are sporadic at best and while I can connect and monitor, the monitoring updates are not continuous and I will lose connection typically in < 10s or the connection freezes and takes 10s plus to re-establish.

This happens even when the PC is not sending MODBUS requests, interestingly however I always seem to be able to transfer programs through 485 without any problems.

FYI, as the PC has no comm ports I am using a usb-232 converters for both channels.

Any ideas what the problem may be?

69
Technical support / Re:use DELAY in dcusfn and cusfn
« on: January 07, 2009, 11:46:51 AM »
OK so if I want to be sure a DM value doesn't change mid scan due to unsynchronised MODBUS comms I would need to map MODBUS DM registers to some other DM registers at the begining of the scan?

Is there any chance that the program can access a DM while MODBUS is writing to it? If so what happens then?

70
Technical support / Re:use DELAY in dcusfn and cusfn
« on: January 07, 2009, 10:33:03 AM »
On a similar note regarding update of I/O. If I am communication via MODBUS at what point do the DM registers get updated. Is this also only during the I/O scan?

71
Technical support / Re:Corrupt EEPROM
« on: January 06, 2009, 11:06:09 AM »
xfmrhelp,

Do you definitely have to reload the code? Or does a reboot (power off then on) solve the problem?

72
Technical support / Stepper Motor Function
« on: November 20, 2008, 11:35:09 PM »
Hi all,

I would like to use a 888 plc to generate the following output to drive a speaker.

Ramp from 600 Hz to 1200 Hz in 10 seconds.
Remain at 1200 Hz for 10 seconds.
Ramp down to 600 Hz in 10 seconds.

I have been playing with the StepMove and StepSpeed functions and haven't been able to simulate this with values that I thought would work.

Is this possible with an 888 PLC. I would be happy with anything that would approximate this (starting and finishing at 0Hz would be acceptable).


73
Technical support / Re:Losing program with power outage - revisited
« on: November 20, 2008, 01:35:10 PM »
After my initial post I installed the cap and diode and the effect was the same. I believe that the PLC was being switched on and off too fast and eventually something would corrupt.

In the end I solved the problem by building an under voltage cutout unit. This depowers the PLC when the voltage drops to 10V and only powers on again when above 11.5V.

74
Technical support / Time and Date
« on: October 25, 2008, 12:55:15 PM »
I notice that the time and date values of the PLC are shown in the online monitoring window.

How can I access these for setting up some funtions to run at certain times of the day?

Also can the PLC time be set using a custom function. This would allow me to reset the time remotely?

75
Technical support / 27.6 Vdc Power Supply
« on: May 26, 2008, 02:39:20 PM »
Hi all,

I have a new application where the power supply to the 888 TriPLC will ideally be 24Vdc battery system. These batteries are charged at 27.6Vdc.

This is not an automobile application so the power supply is well regulated (unless the batteries drain). Can I power the PLC directly from this supply or is the 24Vdc a maximum.

Thanks

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