Chapter 15: LADDeR LOGIC PROGRAmmING
Ladder Logic is one of the languages used to program the SCADA 3000 for control functions.
While the C language is more mathematically capable, it does not handle “On/Off” functions
very well. That’s where Ladder Logic comes in. It is the preferred language for control func-
tions. With C Programming, you write formulas. With Ladder Logic, you build constructs out
of a set of
symbols
. The ladder symbols and expressions represent the program logic used to
control the machine or process. By putting together the various symbols you can build very
sophisticated control programs. The rules/conventions that dictate how programs can be con-
structed are listed within this section. Listed below are the ladder elements and functions that
are supported in the SCADA 3000. A description of each follows the list. Example programs
are illustrated at the end of this chapter.
Note
: Windows NT is required if you plan on writing programs that contain 500
or more instructions.
Ladder Logic Elements Supported
XIC
Examine if Closed
XIO
Examine if Open
OTE
Output energize
OTL
Output latch
OTU
Output Unlatch
OSR
One shot rising
TON
Timer on-delay
TOF
Timer off-delay
RTO
Retentive timer
CTU
Count up counter
CTD
Count down counter
RES
Reset timer or counter
MOV
Move
Comparison Instructions
EQU
Equal
NEQ
Not Equal
LES
Less than
LEQ
Less than or equal
GRT
Greater than
GEQ
Greater than or equal
Math Instructions
ADD
Addition
SUB
Subtraction
MUL
Multiplication
DIV
Division
POW
Power
15-1
Содержание Sensaphone SCADA 3000
Страница 1: ...Sensaphone SCADA 3000 User s Manual Version 2 34...
Страница 6: ...vi SCADA 3000 User s Manual...
Страница 10: ...x SCADA 3000 User s Manual...
Страница 30: ...1 6 SCADA 3000 User s Manual...
Страница 48: ...4 6 SCADA 3000 User s Manual...
Страница 70: ...9 8 SCADA 3000 User s Manual...
Страница 122: ...12 8 SCADA 3000 User s Manual...
Страница 190: ...15 30 SCADA 3000 User s Manual...
Страница 211: ...lead 1 lag 0 else lead 0 lag 1 16 21 Chapter 16 Programming in C...
Страница 212: ...16 22 SCADA 3000 User s Manual...
Страница 236: ...21 8 SCADA 3000 User s Manual...
Страница 248: ...22 12 SCADA 3000 User s Manual...
Страница 258: ...23 10 SCADA 3000 User s Manual...
Страница 274: ...25 8 SCADA 3000 User s Manual...
Страница 288: ...27 8 SCADA 3000 User s Manual...
Страница 294: ...28 6 SCADA 3000 User s Manual...
Страница 296: ...A 2 SCADA 3000 User s Manual...
Страница 302: ...D 2 SCADA 3000 User s Manual...
Страница 318: ...I 2 SCADA 3000 User s Manual...
Страница 320: ...J 2 SCADA 3000 User s Manual...
Страница 322: ...K 2 SCADA 3000 User s Manual...
Страница 335: ...Test Log...
Страница 336: ......