tokio-s7

Async Rust client library for Siemens S7 PLCs over ISO-on-TCP. Pure Rust — no FFI, no native C dependency.

Features

Capability	Status
S7-300/400/200/1200/1500 — read/write DB, multi-area, blocks, SZL	✅
Multi-read / multi-write with automatic PDU batching	✅
S7Area read/write with type decoding/encoding	✅
PLC information — order code, CPU info, CP info, module list	✅
SZL queries — system status list, SZL directory	✅
Reconnect — re-establish TCP + S7 handshake in-place	✅
Pure Rust, zero native dependencies	✅

Add to your project

[dependencies]
tokio-s7 = "0.1"

Quick start

Single connection

use env_logger::Builder;
use log::LevelFilter;
use std::time::Duration;
use tokio::signal;
use tokio::time::interval;
use tokio_s7::client::{S7Client, S7Config};
use tokio_s7::types::PlcType;

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    let config = S7Config::new("10.211.55.3")
        .with_plc_type(PlcType::S1200)
        .with_rack_slot(0, 1)
        .with_auto_reconnect(true)
        .with_port(102);
    let mut client = S7Client::new(config);
    client.connect().await.expect("connect error");

    client.write_int16("DB2.W282", 32).await;
    let result = client.read_int16("DB2.W282").await;
    println!("{:#?}", result);

    Ok(())
}

License

Apache-2.0 — see LICENSE.