Pozdrav,ono sto hocu da napravim je takozvani PC/PPI kabl koji sluzi da se program napisan za Simensov PLC iz "step7 microwin"-a prebaci u PLC odnosno iscita iz njega u step 7.Jedinu shemu takvog kabla sam nasao na net-u i napravio ali kao sto sam rekao ne radi i prijavljuje gresku da mi treba multimaster kabl.Nasao sam jos i ovo:
Posted by: jvdcande
The PPI cable is a simple data-driven RS232-RS485 converter, powered by the PLC.
The pin configuration for the RS232 side is:
2 - Received Data (PC listens)
3 - Transmitted Data (PC Sends)
5 - Signal Common
At the RS485 side you have to find:
1 - Shield (also PLC logic common)
2 - GND (PLC logic common)
3 - Signal B
7 - +24V power from the PLC
8 - Signal A
Baudrates are selectable between 600, 1200, 2400, 9600, 19200 and 38400.
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