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Appendix D Sample L adder Programs
07—20—95 07:58 GE FANUC SERIES 90—30/90—20/MICRO (v6.01) Page 4
| (****************************************************************************)
| (* Overview: *)
| (* *)
| (* This program provides an example of alternating reads and writes from a *)
| (* 90—30 client PLC to a 90—30 or 90—70 server PLC, using the Read Channel *)
| (* and Write Channel commands. *)
| (* *)
| (* The Read Channel command reads %R300 from the remote PLC into %R201 of *)
| (* this PLC. The Write Channel command writes %R200 from this PLC to %R300 *)
| (* of the remote PLC. You can change the value of %R200 in this PLC and *)
| (* see the new value in %R201 of this PLC, as the data is written to and *)
| (* read from the remote PLC. *)
| (* *)
| (* This ladder automatically restarts the read/write logic if the ethernet *)
| (* card is reset (LANIFOK 0 —> 1), or if an error is detected on a read or *)
| (* write command. *)
| (* *)
| (* Hardware Configuration: *)
| (* *)
| (* This ladder is written for a 90—30 Ethernet Controller installed in *)
| (* Rack 0, Slot 2 of a 90—30 system. The LAN Interface Status Word is *)
| (* configured for %I33. The IP address for this Ethernet Controller is *)
| (* 3.0.0.1. The IP address for the remote PLC is 3.0.0.2. *)
| (* *)
| (* First Scan Logic: *)
| (* *)
| (* Rungs 5—8 initialize the data areas for the Read Channel and Write *)
| (* Channel Commands. *)
| (* *)
| (* Rungs 5 and 6: The BLKMV function is used to initialize data for the *)
| (* Read Channel Command. The command block starts at %R101. The Read *)
| (* Channel CRSW is located at %R1. *)
| (* *)
| (* Rungs 7 and 8: The BLKMV function is used to initialize data for the *)
| (* Write Channel Command. The command block starts at %R131. The Write *)
| (* Channel CRSW is located at %R2 *)
| (* *)
| (* PWR_DLY is set to start a 2 second timer. This timer allows the system *)
| (* to initialize if first scan executes on power—up. When the timer fires, *)
| (* the read and write channel CRSWs are cleared, and DO_READ is set on a *)
| (* one—shot. *)
| (* *)
| (* Refer to Chapter 3 for detailed information about the channel commands. *)
| (****************************************************************************)
|
Program: LANRDWT C:\LM90\LAN\LANRDWT Block: _MAIN