Delta MS300 Series User Manual page 683

Chapter 16 PLC Function ApplicationsMS300
Device
Type
Timers perform timing for operations. The timer contains a coil, contact, and a time
value register. When the coil is electrified, and the setting value for the timer is reached,
the contact is actuated (contact A closes, contact B opens), and the timer's fixed value is
given by the setting value. A timer has a regulated clock cycle (timing units: 100 ms). As
Timer
soon as power to the coil is cut off, the contact is no longer be actuated (contact A
opens, contact B closes), and the original timing value returns to zero.
 Timer devices are indicated by: T0, T1–T159, and so on. These devices are
indicated by the symbol T, and the device's order is indicated with a decimal
number.
Data registers are used exclusively to store data and various parameters. When you
use a PLC is to perform various types of sequence control, set time values, and count
value controls, the PLC performs data processing and numerical operations and stores
the operands, parameters, and results in data registers. Each data register contains 16
Data
bits of binary data (one word). Two data registers with adjacent numbers can process
register
double words.
 Data register devices are indicated by: D0, D1– D399, and so on. These devices
are indicated by the symbol D, and the device's order is indicated with a decimal
number.
Ladder diagram images and explanations
Ladder Diagram
Structures
Description of Function
Explanation of
Commands
N.O. switch,
contact A
N.C. switch,
contact B
Series N.O.
Series N.C.
Parallel N.O.
Parallel N.C.
Rising edge-
triggered switch
Falling edge-
triggered switch
Rising edge-
triggered series
Falling edge-
triggered series
Rising edge-
triggered parallel
Command
LD
LDI
AND
ANI
OR
ORI
LDP
LDF
ANDP
ANDF
ORP
674
Table 16-5
Using Device
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C
X, Y, M, T, C