ezeio2:scriptref:start

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ezeio2:scriptref:start [2019-09-02 21:27] – S andrehezeio2:scriptref:start [2019-11-19 01:51] – andreh
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 | ''ModbusTCP()'' | Send & Receive Modbus commands on the Ethernet port | | ''ModbusTCP()'' | Send & Receive Modbus commands on the Ethernet port |
 | ''sleep()'' | Suspend the script for a short time (process events immediately) | | ''sleep()'' | Suspend the script for a short time (process events immediately) |
-| ''msSleep()'' | Suspend the script for a short time (not processing events - DEPRECIATED) | 
 | ''MBRTU_Read()'' | Read a register from a Modbus RTU device | | ''MBRTU_Read()'' | Read a register from a Modbus RTU device |
 | ''MBRTU_Write()'' | Write to a register on a Modbus RTU device | | ''MBRTU_Write()'' | Write to a register on a Modbus RTU device |
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 === State machines === === State machines ===
  
-A common programming pattern in control applications is to use state machines. PAWN and the ezeio implements strong support for state machines. The following is a typical pattern:+A common programming pattern in control applications is to use state machines. PAWN and the ezeio implements strong support for state machines. The following is a typical pattern showing the startup sequence of an engine. Note that there are three @Tick handlers; one for each state. Also note the "entry" and "exit" functions. For more detail, refer to the PAWN language guide.
  
-<code>+<code javascript>
  
   new count = 0;   new count = 0;
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   main()   main()
   {   {
-    SetTickInterval(500);   // set tick interval to 500ms (0.5s)+    SetTickInterval(100);   // set tick interval to 100ms (0.1s)
     state WAITING;          // start in the waiting mode     state WAITING;          // start in the waiting mode
   }   }
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         state RUNNING;        // yes - we're running         state RUNNING;        // yes - we're running
  
-     if(count++ > 5) +     if(count++ > 50) 
-        state WAITING;        // didn't start in 2.5s? Give up and go back to waiting.+        state WAITING;        // didn't start in 5s? Give up and go back to waiting.
   }   }
      
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   @Tick(uptime) <RUNNING>   @Tick(uptime) <RUNNING>
   {   {
-     if( GetField(2) < 100 ) +     if( GetField(2) < 100 )  // Check if the engine stopped 
-        state WAITING;+        state WAITING;        // ..go back to waiting
   }   }
      
 </code> </code>
  
  • ezeio2/scriptref/start.txt
  • Last modified: 2024-03-01 17:24
  • by andreh