Delta CT2000 Series User Manual page 457

Chapter 16 PLC Function CT2000 Series
Device type
Timer
Data register
Ladder diagram images and their explanation
Ladder diagram
structures
Description of Function
A timer is used to complete control of timing. The timer contains a coil, contact,
and a time value register. When the coil is electrified, if the preset time is reached,
the contact will be actuated (contact a will close, contact b will open), and the
timer's fixed value be given by the set value. Timer has a regulated clock cycle
(timing units: 100 ms). As soon as power to the coil is cut off, the contact will no
longer be actuated (contact a will open, contact b will close), and the original
timing value will return to zero.
Device indicated as: T0, T1 to T159, etc. The device is expressed as the

symbol "T," and its order is expressed as a decimal number.
When a PLC is used to perform various types of sequence control and set time
value and count value control, it most commonly perform data processing and
numerical operations, and data registers are used exclusively for storage of data
and various parameters. Each data register contains 16 bits of binary data, which
means that it can store one word. Two data registers with adjacent numbers can
be used to process double words.
 Device indicated as: D0, D1 to D399, etc. The device is expressed as the
symbol "D," and its order is expressed as a decimal number.
Explanation of commands
NO switch, contact a
NC switch, contact b
Series NO
Series NC
Parallel NO
Parallel NC
Positive edge-triggered
switch
Negative edge-triggered
switch
Positive edge-triggered
series
Negative edge-triggered
series
Positive edge-triggered
parallel
Negative edge-triggered
parallel
Block series
Command
LD
LDI
AND
ANI
OR
ORI
LDP
LDF
ANDP
ANDF
ORP
ORF
ANB
16-16
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
X、Y、M、T、C
N/A