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Appendix 2.1.4 Timer comparison
TableApp.2.4 Timer Comparison
*1 : The Q00J/Q00/Q01CPU can use Z0 to Z9.
The Universal model QCPU can use Z0 to Z19.
(1) Cautions on using timers
QCPU updates the present value of timers and turns ON/OFF the contacts of them at the
execution of OUT T instruction.
Therefore, if "Present value Set value" when the timer coil is turned ON, the contact of
that timer is turned ON.
When creating a program in which the operation of the timer contact triggers the operation of
another timer, create the program for the timer that operates later first.
In the following cases, all timers go ON at the same scan if the program is created in the
order the timers operate.
• With high speed timers, if the set value is smaller than a scan time.
• With slow timers, if "1" is set.
Function QCPU AnUCPU AnACPU AnNCPU
Low speed timer
Measurement
unit
100ms (default value)
Change of measurement unit at the parameter is enabled.
QCPU : 1 to 1000ms (1ms unit)
Fixed at 100ms
Designation
method
High speed timer
Measurement
unit
10ms (default value)
Change of measurement unit at the parameter is enabled.
QnUCPU : 0.01 to 100ms (0.01ms unit)
QCPU(Other than QnUCPU)
: 0.1 to 100ms (0.1ms unit)
Fixed at 10ms
Designation
method
High speed timer setting: Conducted by sequence program
High speed timer setting: Conducted at parameters
Retentive timers
Measurement
unit
Same measurement unit as low speed timer Fixed at 100ms
Designation
method
High speed reten-
tive timer
Measurement
unit
Same measurement unit as high speed timer
None
Designation
method
High speed timer setting: Conducted by sequence program
Setting range for set values 1 to 32767 1 to 32767
Processing for set value 0 Momentarily ON No maximum (does not time out)
Index modification
Contact Enabled (only Z0 and Z1 are usable) Enabled Disabled
Coil Enabled (only Z0 and Z1 are usable) Disabled Disabled
Set value
Enabled (Z0 to Z15 are usable)
*1
Disabled Disabled
Present value
Enabled (Z0 to Z15 are usable)
*1
Enabled Enabled
Update processing for present value
When OUT Tn instruction is executed When END processing is done
Contact ON/OFF processing
T0
K100
T0
K100
T0
H K100
High speed timer specification
T200
K100
ST0
K100
T0
K100
ST0
H K100
High speed timer specification