Internet PLC Forum

Did you enable the username/password settings in the "Ethernet & ADC Configuration"? If so it will require you to key in the username and password that you have defined in order to login via the Ethernet.

If you are able to connect via the TLServer and serial port, then you can connect to the PLC and retrieve the Ethernet settings and disable the username/password or add in a correct username/password to protect the connection.

In TBASIC all operators are operating on 32-bit  number.

Any integer numbers are always converted into 32-bit integer before applying the math or comparison operation.

So even if a number is contained in DM[n] the number is first converted ito a 32-bit number and thus any comparison has to be made against a 32-bit number. If DM[n] contains a negative number it will be sign-extended during conversion.

Current generation of ExcelLink and TLServer are not able to run in the background without an open window. There really isn't a demand for such a feature so far. If the program runs in the background without you knowing there are people would wouldn't like it either.

Unfortunately the PLC node name defined in i-TRiLOGI is not recognized by the DHCP server and thus it is not displayed. So only the MACID should be used to identify the PLC.

In PLC application it is often better to use a static IP address. The DHCP IP address can change when the router loses power for some time. So if you want to use DHCP you should do an IP address reservation in the router so that the router will always assign the reserved IP address to the PLC. The reservation table inside the router often allows you to define a name for the device that you reserve the IP address. This is where you can put in a meaningful name.

The following picture is captured from a Cisco router that shows you where you can define the name of the device.

The controller output represent the amount of control adjustment to be added to the existing open loop output value based on the error it receives from the difference between the measured value (feedback) and the setpoint value.

E.g. if  in order to achieve a 120 lux, a lighting controller should normally output 40% (open loop value). Now when sun light shine into the area adds more light to the place and this creates a higher feedback lux reading. An error is generated because the feedback is now larger than the set point (120 lux). The error is fed into the PID loop which creates a negative output. This will result in the controller reducing its output accordingly until either the total light output is brought back to the setpoint (120 lux) or if daylight is too strong then the output may eventually be reduced to 0.  

Note that the 0.0.0.0 IP address setting is only available to SmartTILE-Fx based PLCs (Fx1616-BA, Fx2424 and EZWire1616).

SmartTILE-Fx CPU board will only query for the IP address when it is first powered up. If the router is switched OFF then the PLC will not be able obtain a DHCP assigned IP address and therefore will become offline. It does not periodically request for IP address from the router so there should be no effect on the scan time after the PLC has been powered up.

Since in many applications the PLC is not connected to the router when in operation this design concept is to prevent the PLC wasting precious CPU cycle to query for IP address from router that it is not connected to.

For applications that are connected to a router we do recommend selecting a fixed IP address that it outside of DHCP range to ensure that the PLC is reachable regardless of when the router is powered up. Otherwise you will need an LCD display to inform user of the IP address that it obtains from the DHCP server before you can connect to it.

Which location of EEPROM do you want to save these data to?

E.g. if you want to save DM[700] - DM[704] to EEP location 100 to 105.


FOR I = 0 to 4
   SAVE_EEP DM[700+I],   100+I
NEXT

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To load values from EEP location 100-104 back to DM[700] to DM[704]:

FOR I = 1 to 4
   DM[700+I] = LOAD_EEP(100 + I)
NEXT

SETSYSTEM 16,4 will not affect the internal OUTPUT bit. It just will not update the physical output affected by the command but the computed value will stay.