hi all,
i've been using simatic s7 200/300/400 series for nearly 4 years and i always connected my pg directly to the plc via siemens mpi cable as i learned from documents and i saw from others. today i had to connect to a s7 200 (i programmed it before) with my pg again but i couldn't connect. i changed the cable, (cable is siemens also), i changed the plc, i changed the pg! but i couldn't connect again.
finally 4 hours later, i tried to connect a pb connector to the plc side and pluged the mpi cable via it. (the pb connector with a db9 connector behind it) and turned on the terminating resistor.
it worked!
i still can not uınderstand how i could connect with only mpi cable before (with both of the siemens pgs)
does any one understand it?
thanks.
i've been using simatic s7 200/300/400 series for nearly 4 years and i always connected my pg directly to the plc via siemens mpi cable as i learned from documents and i saw from others. today i had to connect to a s7 200 (i programmed it before) with my pg again but i couldn't connect. i changed the cable, (cable is siemens also), i changed the plc, i changed the pg! but i couldn't connect again.
finally 4 hours later, i tried to connect a pb connector to the plc side and pluged the mpi cable via it. (the pb connector with a db9 connector behind it) and turned on the terminating resistor.
it worked!
i still can not uınderstand how i could connect with only mpi cable before (with both of the siemens pgs)
does any one understand it?
thanks.