Modus switch problems

Hello,
I have some problems with my configuration.
I have a PLC to controll my shutters via Modbus TCP. Now i program some switches in HASS. With this switches i can controll the shutters. But i cant controll multiple shutters at the same time. Every time i close some shutters in HASS i have to wait a few seconds until i can controll the next one. I also tried groups but here is the same problem.
Does any one have some idea?


modbus:
  - name: SPS 
    type: tcp
    host: 192.168.1.137
    port: 502


    switches:
    - name: Speisfenster schließen
      address: 10
      write_type: coil
    - name: Speisfenster öffnen
      address: 11
      write_type: coil