The Siemens 6ES7193-4LH20-0AA0 is a pack of 200 color coding plates in turquoise, designed for terminal modules of the ET 200S and ET 200S Compact distributed I/O system.
These color coding plates assist in wiring identification during assembly and maintenance, allowing you to quickly match terminal positions to circuit labels. For the ET 200S series, this is a standard accessory used on terminal module rows.