Mitsubishi Electric MELSEC FX Series - Page 73

5 Basic Instruction
5.4 Operating Timer
71
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of Instruction
4
How to Read Explanation of Instructions
5
Basic Instruction
6
Step Ladder Instructions
7
Applied Instructions
8
Interrupt Function and Pulse Catch Function
A
Relationships between devices and addresses
Function and operation explanation
1. OUT_T operation
1) When the operation result up to the OUT_T operation is ON, the timer coils is ON and counts until the set
value is reached. When the set time expires (or reaches the set count), the contacts become as follows:
2) When the operation result up to the OUT_T operation turns OFF from ON, the timer parameters become
as follows.
*1. Not supported by the FX
2N, FX2NC, FX1N, FX1NC, FXU, FX2C, FX0 or FX0S PLC.
*2. Not supported by the FX
1S, FX0N, FX0 or FX0S PLC.
2. Clearing integrating timer
After the set time expires, the current value of the integrating timer is cleared and the contacts are turned OFF
by the RST.
3. Timer set value
The set value can be specified directly by a decimal number (K) or indirectly using a data register (D) or
extension register (R).
Indirect setting by the extension register (R) is applicable only to the FX
3U and FX3UC PLCs.
No negative numbers (-32768 to -1) can be set.
If the timer value is set to "0", the time expires at the same time as the OUT_T activates.
4. OUT_T operation
The following processes take place when the OUT_T activates.
1) The OUT_T TC coil turns ON or OFF.
2) The OUT_T TS contacts turn ON or OFF.
3) The OUT_T TN current value is changed.
If the OUT_T is skipped by an instruction such as JMP while the OUT_T is ON, neither the current value is
updated nor contacts are turned ON or OFF.
When one particular OUT_T operates more than once within the same scan, the current value is updated as
many times as the timer operates.
NO (normally open) contact Timer is conductive.
NC (normally closed) contact Timer is not conductive.
Timer type Timer coil
Current timer
value
Before time-up After time-up
NO (normally
open) contact
NC (normally
closed)
contact
NO (normally
open) contact
NC (normally
closed)
contact
100 ms timer
0.1 to 3276.7 seconds
OFF 0 Nonconductive Conductive Nonconductive Conductive
10 ms timer
0.01 to 327.67 seconds
1 ms timer
*1
0.001 to 32.767 seconds
100 ms integrating timer
*2
0.1 to 3276.7 seconds
OFF
Holding current
value
Nonconductive Conductive Nonconductive Conductive
1 ms integrating timer
*2
0.001 to 32.767 seconds