FIRST SCAN S7-1200

[deray88]

Estimados Colegas:

Tengo un problema con la programación de un PLC SIEMENS de la serie S7-12000.

Ya he configurado el BYTE para la las marcas del sistema (en mi caso he seleccionado la marca %M2800), en donde el bit %2800.0 estaría el FIRST SCAN, en el bit %2800.2 estaría el ALWAY TRUE, y en en el bit %2800.3 estaría el ALWAY FALSE.

Luego he intentado utilizar el bit %2800.2 (ALWAY TRUE), para indicarle a una pantalla HMI que el PLC está activo y en modo RUN. Pero no he podido lograr que este bit cambie a un "1" lógico y se active la bobina de salida con la información para la HMI.

Alguien podría ayudarme con este problema, y decirme si me falta hacer algo.


De antemano muchas gracias.

Dear Colleagues:

I have a problem with a PLC's programming SIEMENS of the series S7-12000.

I already have configured the BYTE for her the check marks of the system ( in my case I have selected the check mark %M2800 ), in where the bit %2800.0 would be the FIRST SCAN, in the bit %2800.2 would be the ALWAY TRUE, and in in the bit %2800.3 would be the ALWAY FALSE.

Next I have tried to use the bit %2800.2 ( ALWAY TRUE ), in order to indicate HMI to a screen that the PLC is active and in mode RUN. But I could have achieved that this bit changes to a 1 logician and activate him the bobbin of exit with the information for the HMI.

Somebody would be able to help me with this problem, and being said if I have yet to do something.


In advance a lot of thanks.

[dekor]

Hi,
first look to PLC Tags, default tag table and select "Visible on HMI" and "Accessible from HMI".

If still not work, then try to allocate that bit 2800.2 to a different memory, let say 300.2
Then declare the 300.2 as tag and select the property " Visible on HMI" an supervise that new memory on HMI.

dekor.