Programming Concepts
DVP-ES2/EX2/SS/SA2/SX2/SE is a programmable logic controller spanning an I/O range of
10–256 I/O points (SS2/SA2/SX2/SE: 512 points). PLC can control a wide variety of devices
to solve your automation needs. PLC monitors inputs and modifies outputs as controlled
by the user program. User program provides features such as boolean logic, counting,
timing, complex math operations, and communications to other communicating products.
Chapter Contents
2.1
ES2/EX2 Memory Map .............................................................................................................. 2-2
2.2
SS2 Memory Map ...................................................................................................................... 2-5
2.3
SA2 Memory Map...................................................................................................................... 2-8
2.4
SX2 Memory Map .................................................................................................................... 2-11
2.5
Status and Allocation of Latched Memory ........................................................................... 2-14
2.6
PLC Bits, Nibbles, Bytes, Words, etc ................................................................................... 2-15
2.7
Binary, Octal, Decimal, BCD, Hex ......................................................................................... 2-15
2.8
M Relay .................................................................................................................................... 2-17
2.9
S Relay..................................................................................................................................... 2-30
2.10
T (Timer) .................................................................................................................................. 2-30
2.11
C (Counter) .............................................................................................................................. 2-31
2.12
High-speed Counters ............................................................................................................. 2-34
2.13
Special Data Register ............................................................................................................. 2-39
2.14
E, F Index Registers ............................................................................................................... 2-51
2.15
Nest Level Pointer[N], Pointer[P], Interrupt Pointer [I] ....................................................... 2-51
2.16
Applications of Special M Relays and D Registers............................................................. 2-55
2 - 1