AEG Modicon Micro 84 - Reference Numbers; Ladder Logic Programming Pad

i
Program Name
Writer
Date
1
2 3 4 5
6 7
Comnwntn
A
6 -- ----
---- ---- ----
---- ----
--
c -- ----
---- ---- ----
----
---- --
D -- ----
---- ---- ----
---- ---- --
Program Name
Writer
Date
Nhvbrk Number
1
2
3 4
5
6 7
A
B
c--
D
Figure 7-4. Ladder Logic Programming
Pad
7.5 REFERENCE NUMBERS
In the programming of the MICRO 84 Programmable Controller, four digit
reference numbers are used in building the program logic. These reference
numbers are divided into three broad categories: discrete, register, and
sequencer. Discrete references are used for items that can be either ON or
OFF, such as contacts, pushbuttons, motor starters, relay coils, limit
switches, solenoid valves, etc. Register references are used to store
numeric values such as counters, timers, analog values, etc.; all registers
can store numbers that are three decimal numbers long (O-999). These
numbers are stored in binary-coded decimal @CD) format. Sequencers
operate like stepping drum rotary switches with a single reference contact
at each position of the stepping switch. Sequencer operations are
controlled by numeric values placed in specific registers (see
“Sequencers” (Drum Programmers) later in this section).
Commants
7-3
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com