Question:
How can I establish communication with an S7-200 PLC via PPI?
Solution:
To establish communication with an S7-200 PLC via PPI, you must use version 2.09 (or higher) of this driver, and configure the following items on IOKit’s Serial tab:
- DTR: ON
- RTS: Toggle
- Delay Before Send: 200
- Delay After Send: 200
- Interbyte Delay: 100
- InterFrame Delay: 10
These settings are necessary because an S7-200 PLC via PPI is slower than other PLCs from Siemens.
