On the FX90 Supervisory Controller's top side, two RS-485 ports operate as COM1 and COM2. Each port is capable of up to 115,200 baud, and uses a 3-position, screw terminal connector.
Use shielded, twisted-pair, 18-22 AWG cabling to wire in a continuous daisy chain fashion to other RS-485 devices: minus-to-minus, plus-to-plus, and shield-to-shield. Connect the shield wire to earth ground at one end only.
For more information about wiring guidelines, refer to FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670).
Callout |
Description |
---|---|
1 |
RS-485 port A (COM1) |
2 |
RS-485 port B (COM2) |
3 |
A maximum of four total option modules are supported. The FX90 Supervisory Controller license determines the options available. |