The Option Boards are mounted to the option board slot on the CPU Unit.
| Specification | Supported protocol | Model | 
|---|---|---|
| One RS-422A/485 port. Transmission distance: 50 m. Connection type: Screwless clamping terminal block (5 terminals) | Host link, Modbus-RTU master, and no-protocol | NX1W-CIF11 | 
| One RS-422A/485 port (isolated). Transmission distance: 500 m. Connection type: Screwless clamping terminal block (5 terminals) | NX1W-CIF12 | 
 
				![NX1W-CIF1[] - Omron Option Boards](https://axmatic.com/wp-content/uploads/2024/01/Omron_Option-Boards_NX1W-CIF11.webp)
 
          	
            
           
         
          	
            
           
         
          	
            
           
         
          	
            
           
         
          	
            
           
        