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protected will be written to parameters WRPROT1 and WRPROT2, respectively. If, e.g., the
variables #530 through #540 are to be protected, the respective parameters have to be set as
WRPROT1=530 and WRPROT2=540.
20.12.3 System Variables
The system variables are fixed ones providing information about the states of the system.
Interface input signals - #1000–#1015, #1032
16 interface input signals can be determined, one by one, by reading the system variables #1000
through #1015.
Name of system variables Interface input with reference to the
PLC program
#1000 I[CONST+000]
#1001 I[CONST+001]
#1002 I[CONST+002]
#1003 I[CONST+003]
#1004 I[CONST+004]
#1005 I[CONST+005]
#1006 I[CONST+006]
#1007 I[CONST+007]
#1008 I[CONST+010]
#1009 I[CONST+011]
#1010 I[CONST+012]
#1011 I[CONST+013]
#1012 I[CONST+014]
#1013 I[CONST+015]
#1014 I[CONST+016]
#1015 I[CONST+017]
where CONST=I_LINE*10 and I_LINE is a parameter. Thus, any arbitrary interface input can be
read.
The values of the above variables are
0= if the contact at the input is open,
1= if the contact at the input is closed.
The above 16 inputs can be read simultaneously at variable #1032. Depending on the system
variables assigned to the one-by-one reading, the value will be
Accordingly, with 24V applied to inputs #1002 and #1010, the rest of inputs being open, the value
of variable #1032 will be
The variables of the interface inputs are "read only" ones, and may not be used on the left side of a
definition instruction.