Internet PLC Forum

I have a similar problem as Monty K below whereby I also have a master & 9 slave T100MD's all connected together via their RS485 ports, though in my case each of them are connected to an ethernet network via individual nPort express RS485 to ethernet converter server units.
The problem I have is that the system will function happily for over a day without incident and then for no apparent reason all the slaves will lock up!
I've incorporated a MaRST facility into each slave where if I press two buttons simultaneously the PLC will reset (which normally works OK),  but when I get these lockup conditions occuring the MaRST doesn't work. Only a complete power down/power up cycle works, which is far from  ???ideal!
Do you have any idea as to what maybe causing these simultaneous lockups occuring, and why the MaRST facility doesn't work when it happens? ?

My master T100 needs to control a number of contacts within my T100 slave unit and I understand that I would need to use the 'Write Relays' command to do this. Within this command is a Channel # identifer, each channel containing 8 bits (maybe you wouldn't mind providing an example showing how relays are addressed and then turned on and off by using this command?).

However, I also note that there is a 'Write Single I/O bit' command (Wb) contained in the E10 manual, that can write to an individual bit. This appears not to contain a channel # identifier; only a bit position identifier. Can I therefore assume that I can't use this command within a T100, and if I can, how would I address the channel #'s?

I'm running a program of around 6.5Kb on my T100MD which takes in a rapid pulse train and operates a number of outputs also in a rapid fashion.
Unfortunately counts are being missed due to the relatively long scan time for this program (using the HSC is not an option as this just triggers CusF's and my requirement is too rapid for these to execute in the time available), so I was wondering if sharing the program between a Master T100MD and a Slave T100MD would be an option.
I would use the Master to run the main control program, while the slave would service the high speed counting of the pulse train, and the high speed operation of the outputs.
I have three questions:
1) Can I simply connect them together via the digital connectors (as you would do with a 4040 board), and have direct access to both eeproms, so that I can upload 1 program of say 5kb's into the Master and one of 1.5kbs into the Slave, thuse reducing the scan time on both? Or will I need to connect them together using the RS485 method?
2) Would this arrangement allow me to easily control the Slave from the Master, and to pass data to and from each of them?
3) Would this arrangement be more straightforward to do, rather than using an E10 as the slave (can this acquire a high speed pulse train too?).

Is it possible to display a counter output (including an HSC output), so that for example 1234 can be displayed as 12.34?  Or 654321 is displayed as 6543.21

If not, can you please advise how I can?  Thanks.

Could you please tell me what the typical scan time is for a program of approx 6000 words (max capacity of PLC), and would it be half that time for a program of 3000 words i.e. is scan time directly proportional to program length?

I understand the T100MD has two HSC's, I/p's #3 & 4 form the incrementing and decrementing inputs to HSC #1 and I/p's #5 & 6 form the two identical channels to HSC #2. However, in the documentation, there are 8 channels referred to? Can you please explain how there are 8 channels, and how do I utilize these?

In the simulator, there is also an additonal HSC3 shown which seems to suggest there is at least a further HSC available. If so, how do I access this?

Is it possible to control a sequencer from within a cusfn routine?

I need to reset a sequencer back to level 1 if a certain logical condition is met from within a custom function. Any example would be appreciated. Thanks!

I have noted in an earlier forum article that there is a TBasic 'TOGGLEIO' instruction for the M series that allows an output to be toggled open and closed by the alternate pushing of an input. However, despite my many endeavours to find any reference to this very useful instruction in your 'documentation', I have come to the conclusion that it doesn't exist.....or does it? Because by placing the instruction in a Cusfn it does seem to compile.....but only on its own, as I've tried all kinds of syntax arrangements with it (references to various IO), but it then fails to compile.

Could you therefore please supply some syntax information for this instruction, and also could you let me know if there are any other useful Tbasic instructions that exist, which for some reason or other are also not documented? Thanks