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plc il -18.8

value.

I:001/0 TON Timer T4:0 Delay 5s

ADD SourceA 3 SourceB T4:0.ACC Dest N7:0

START:LD I:001/0 TON(T4:0,1.0,5,0) LD 1 ADD (3, T4:0.ACC, N7:0) END

Figure 18.6 A Complex Ladder Rung and Equivalent IL

An example of an instruction language subroutine is shown in Figure 18.7. This program will examine a BCD input on card I:000, and if it becomes higher than 100 then 2 seconds later output O:001/00 will turn on.

plc il -18.9

Program File 2:

Label

Opcode

Operand

Comment

START:

CAL

3

(* Jump to program file 3 *)

Program File 3:

Label

TEST:

ON: Opcode

LD BCD_TO_INT ST GT JMPC CAL LD ST CAL LD ST RET

Operand

%I:000

%N7:0 100 ON RES(C5:0) 2 %C5:0.PR TON(C5:0) %C5:0.DN %O:001/00

Comment

(* Load the word from input card 000 *) (* Convert the BCD value to an integer *) (* Store the value in N7:0 *) (* Check for the stored value (N7:0) > 100 *) (* If true jump to ON *) (* Reset the timer *) (* Load a value of 2 -for the preset *) (* Store 2 in the preset value *) (* Update the timer *) (* Get the timer done condition bit *) (* Set the output bit *) (* Return from the subroutine *)

Figure 18.7 An Example of an IL Program

18.4 SUMMARY

* Ladder logic can be converted to IL programs, but IL programs cannot always be converted to ladder logic.
* IL programs use a stack to delay operations indicated by parentheses.

plc il -18.10

• The Allen Bradley version is similar, but not identical to the IEC 61131 version of IL.

1.

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