This document introduces the RS-485 communication wiring method between Siemens S7 300 and DOP-A/AE, DOP-AS57, DOP-AS35/AS38 and DOP-B series HMI, as well as the corresponding Read/Write address definitions.
This manual describes the configuration and programming of the Siemens S7 300 PLC when used without a PC adapter. It covers communication interfaces such as RS‑485 and RS‑232, register formats, and data area definitions.
The document also includes important notes on communication parameters, maximum numbers of connected HMIs, special parameters like HSA limits, and guidelines for timer and counter value handling. This manual is written in Japanese.
| Maximum simultaneous HMIs per PLC | 4 |
|---|---|
| Maximum HSA value | 31 |
| Timer value digits | 3 |
Up to four HMIs can be connected simultaneously.
The maximum HSA value is 31.
Timer values are limited to three digits.