Internet PLC Forum

In order to use AI in our PLC you need to use the TBASIC custom function ADC(n). You can use a clock pulse to periodically execute a custom function that contains the ADC(n) statement to get frequent update of the analog data.

The simulator support AI simulation. You can enter the AI data at the logic simulator screen.

1) Which PLC model are you using?

2) Which capacitor? Is it the one on the PLC or the capacitor that you have added? What is the voltage rating of the capacitor?  The voltage rating must be higher than the actual voltage applied on the cap.

3) If it is the one on the PLC and you have replaced the capacitor with correct rating and it still blow,then you should send the board back to the supplier or to us for checking to find out the cause of the problem.

1) Output 10 volts mean that the PLC has to have analog output 0-10V. Only the T100MD1616+ has an analog output that can drive 0-10V load.

2) RS485 is communication interface and has nothing to do with the analog output. RS485 does not need 10V output. All our M-series PLC have RS485 so any model can use this method to interface to the servo motor.

3) You need to get the servo motor's communication protocol and then write a custom function to output the needed command strings to talk to the SERVO motor. Most likely you will use the NETCMD$ command to talk to the servo motor controller. There are other command available to talk to 3rd party devices: PRINT #, INPUT$, ?INCOMM, OUTCOMM.

4) You cannot use READMODBUS or WRITEMODBUS commands unless your servo motor support the MODBUS protocols.

5) There is no need to connect the PLC to the PC's modem. You just need a serial cable between the PLC and the PC. The PC will need to run the TLServer and have an internet connection. The PC's internet connection can be by any method (dialup, LAN, Wifi. whatever). Once the PC is connected to the internet the PLC become accessible by TRiLOGI client via the Internet.

Input #16 belongs to channel 00. So you should be writing to "WI0080*" to turn ON input 16.  However, note that doing so will also affect input #1 to 15 by turning them OFF momentarily. This may have effect on your ladder logic program.

The correct way of doing it is to first read from channel 00 usign RI00*. Then use the OR mask to set the bit of interest:

      INVAR = INVAR | &H80   ' force bit 15 to ON

Then write it back to the PLC using the

"WI00"+ INVAR (converted to two digit hex)+"*"+CR.

If you need to read the analog data at high speed then you need to execute a non-differentiated custom function {CusFn} at every scan of the ladder program. Within the custom function you are reading the ADC input value to make a decision. Note that any SETIO or SETBIT command executed within a custom function will not update the physical output until the end of the ladder logic scan. Hence, if you need to turn on an output within this custom function, then you should allow this custom function to end so that the ladder logic can scan to the end of the whole ladder program and the physical output can be updated.  

If you are already doing the above and feel that the input ADC is not updating quick enough, then you may have to remove the 0.1uF capacitor at the corresponding ADC input. The 0.1uF acts as a low pass filter and is meant to filter out the high frequency switching noise but it also means that the frequency response is altered.

Note that ADC input #7 and #8 do not have 0.1uF capacitor. So a quick way to test if the 0.1uF cap is affecting your need for high refresh rate is to move your sensor output to the ADC #7 or #8 and change your ADC(n) command accordingly.

Maximum current for for output #7 and #8 for T100MD888 and T100MD2424 are:

1) Peak at 10A
2) Continuous at 2A for 100% duty cycle without heat sink.

The MOSFET actually can take higher current but you will then need to attach heat sink to the MOSFET's metal tab and also provide forced air cooling to the heat sink.

For T100MD1616+, the peak current is 1A and continuos current is 250mA.

Can you explain how you program to turn ON output #8? You mentioned PWM and yet you said you want it to turn ON when the INPUT is ON and turn OFF when the switch to the input is OFF? If you are using it as an ON/OFF only output, then you can just treat it like a regular output and not use its PWM feature. e.g.

    IN1                                            OUT1
|--||--------(OUT)

You only use the SETPWM output if you want to use the duty cycle to control speed to the motor. In that case, when the switch is OFF, you should trigger a [DIFD] funciton such that another custom function is executed to SETPWM to 0 duty cycle and the motor will be shut off.

    IN1                                                                RLY1
|---||----------[DIFD]
|
|    RLY1                                                  Fn_#2
|---||---------{dCusF}  ' Fn_#2 SETPWM to 0%

I tried compiling your program, first without defining the label for OUT3 and OUT4 and I got syntax error. After defining the label name for OUT3 and OUT4 in the output table then the program compiled without any problem.

Note that to use SETIO or CLRIO, the label name for the I/O bit that you want to set/clear must be defined in the table. OUT1 does not automatically means output #1. It is just a label name and can be any I/O bit (yes, it can also be a timer or counter bit! although there is little reason for doing so since it can confuse you).