This crate allows to connect to Beckhoff TwinCAT devices and other servers speaking the ADS (Automation Device Specification) protocol.
Use with Cargo as usual, no system dependencies are required.
[dependencies]
ads = "0.4"Minimum supported Rust version is 1.63.0.
A simple example:
fn main() -> ads::Result<()> {
// Open a connection to an ADS device identified by hostname/IP and port.
// For TwinCAT devices, a route must be set to allow the client to connect.
// The source AMS address is automatically generated from the local IP,
// but can be explicitly specified as the third argument.
let client = ads::Client::new(("plchost", ads::PORT), ads::Timeouts::none(),
ads::Source::Auto)?;
// On Windows, when connecting to a TwinCAT instance running on the same
// machine, use the following to connect:
let client = ads::Client::new(("127.0.0.1", ads::PORT), ads::Timeouts::none(),
ads::Source::Request)?;
// Specify the target ADS device to talk to, by NetID and AMS port.
// Port 851 usually refers to the first PLC instance.
let device = client.device(ads::AmsAddr::new([5, 32, 116, 5, 1, 1].into(), 851));
// Ensure that the PLC instance is running.
assert!(device.get_state()?.0 == ads::AdsState::Run);
// Request a handle to a named symbol in the PLC instance.
let handle = Handle::new(device, "MY_SYMBOL")?;
// Read data in form of an u32 from the handle.
let value: u32 = handle.read_value()?;
println!("MY_SYMBOL value is {}", value);
// Connection will be closed when the client is dropped.
Ok(())
}All ADS requests are implemented.
Further features include support for receiving notifications from a channel, file access via ADS, and communication via UDP to identify an ADS system and set routes automatically.
A utility called adstool is found under examples/, very similar to the one
provided by the C++ library.