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Topics - ccdubs

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16
Technical support / F1616 Relay Outputs
« on: May 28, 2010, 02:52:22 PM »
What are the 24Vdc current ratings of each relay output on the F1616 PLC.

The manual says 5A @24V/120VAC. I assume 24V is DC.

If the rating is 5A each how does the board conduct a maximum of 60A (5 A *12 relays) safely? There doesn't appear to be any significant conductors and the COM pin is quite small.

Can you also confirm that there are no issues connecting +24Vdc to the COM terminal of the relay DO's.

Many thanks.

17
Technical support / Connecting T100MD888 to microcontroller
« on: November 26, 2009, 11:25:14 AM »
I want to be able to communicate between a T100MD888 to a single PICAXE microcontroller via RS485.

Does anyone have experience with doing this or can perhaps give me some idea of how this would be done?

Cheers

18
Technical support / Com 1 Issue
« on: April 25, 2009, 09:59:40 PM »
Hi,

I'm not exactly sure how but I think I may have damaged com 1 on a T100MD. I think an overvoltage may have occured.

What components should I try changing to get it working. I have another "spare" PLC that I can canabalise.

Thanks

19
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

20
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?

21
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).


22
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?

23
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

24
Technical support / Java Updates
« on: May 11, 2008, 05:57:08 PM »
Hi all,

A couple of months ago I installed all the java updates but then couldn't get TLServer to start. When I uninstalled Java and reinstalled the version on the TriLogi disk, all was OK again.

Should I be installing Java updates as they come through?

Thanks

25
Technical support / Hysteresis on T100MD-888 Digital Input
« on: March 28, 2008, 02:28:06 PM »
Hi all,

Is there a hysteresis on the T100MD-888 digital input? I have an application where a DI will typically have 5V on it and when a switch is closed it gets pulled to 0V. When the switch is released it is pulled back up to 5V.

The interesting thing is when the PLC is started the input at 5V reads OFF, when the switch is closed the input reads ON. But when the switch is reopened the input still reads ON.

Is there anyway that I can make this switch more definitively? Anyone know what the switching levels are for the DI's?

26
Technical support / STATUS(2) and MODBUS
« on: February 20, 2008, 02:55:19 PM »
Hi All,

I am having difficulty with the status(2) command. I am using the writemb2 (RTU) command to send data to a PC. The PC receives the data correctly but it seems that the PLC is not sending STATUS(2) = 1.

Is is possible that the PC receives the datagram but the PLC thinks there was a transmission fault?

Thanks

27
Technical support / MODBUS RTU and PLC address
« on: February 05, 2008, 06:20:02 PM »
Hello again.

I am having some difficulty using MODBUS RTU where I have 20 remote PLCs connected to a SCADA system running DAQFactory.

All comms works OK apart from the PLC's with addresses in the A to F range. It seems that when these PLC's are addressed for reading that all the others on the line also try and respond as if they all had the same address! This doesn't happen when polling the other PLC's.

Any ideas on why this may be?

28
Technical support / Output State on Power Off
« on: January 17, 2008, 02:59:14 PM »
Hi All,

Here's another one for you related to the power loss topic posted previously.

I have a PLC whose outputs pull down input pins (5V high) on a PIC micro to perform certain actions. The PLC is powered by a seperate supply which shares the same gnd as the PIC supply.

When the supply feeding the PLC shuts down, the pins on the PIC get pulled low and unwanted action occurs. I found that if I disconnect the output connector on the PLC that the PIC action stops. The same is true when I installed the diode in the +ve supply to the PLC.

The path to gnd is probably through some other load but are there any extra measures (beyond the diode in the +ve line) I can take within/on the PLC to stop this. I can't put diodes in each ouput as the Vdrop across them doesn't let the PIC recognise a low on the input pin.

Once again any and all help appreciated.

29
Technical support / Losing program with power outage - revisited
« on: December 22, 2007, 03:17:45 PM »
Hello,

I am experiencing some issues not unlike the other recent posting. I have a TriPLC being powered at 12V from a 24 to 12 V DC-DC converter which is fed from a 24V battery.

When the mains fails and the battery begins to drain the PLC code corrupts (goes into pause, loses ID and requires download password). I think this is due to the DC-DC converter which seems to cycle when it's input votage gets too low. According to the data sheet I thought the DC-DC converter unit would completely shutoff at 19V but it seems more like 10-12V input.

Can this cycling be causing the PLC code to corrupt? I have installed a 1000uF capacitor and it made no difference.

Short of buying a new converter are there any other recomendations to prevent this from happening.

The converter is a MeanWell SD-50B-12 which I would have thought was a reasonable product.

Any help is greatly appreciated.

Thanks

30
Technical support / RS485
« on: November 27, 2007, 01:07:29 PM »
Hi Again All,

I have an array of 3 T100 PLC's (soon to be expanded to 5) for bench testing with later install into a large RS232 network.

To save programming time I would like to use a RS485 network. I have purchased a MOXA Uport 1130 USB to RS485 converter. This has been set to Com9 and RS485 2 Wire. I have connected this to the first PLC/s RS485 port along with 120 ohm (2 x 240 in parallel) terminating resistors.

For the life of me I can't get the TRIlogi program to connect to the PLC. The server opens the port OK but I don't know how to test an RS485 network from there the IR* command obviously doesn't work as it is a network.

Is there anything else I should be doing, e.g., links on PLC, etc.

Do I need the gnd connection? The distance is only 1 m.  I currently have R+(D+) and R-(D-) connected to the + and - RS485 ports respectively. I have tried every combination of polarity and gnd connection with no success.

Any help is once again appreciated.

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