Equipments (Devices) > CFW503 > Ladder > Timer

Timer block that, when energized, enables the output after a delay set by PT.

Ladder Representation

TON_block

Block Structure

Variable Type	Name	Data Type	Description
VAR_INPUT	IN	BOOL	Block enabling
	PT	WORD UINT DWORD1 UDINT1	Delay of output drive
	TIMEBASE	WORD	Time base for PT and ET
VAR_OUTPUT	Q	BOOL	Block output
VAR_OUTPUT	ET	WORD UINT DWORD1 UDINT1	Counter elapsed time
VAR	TON_INST_0	TON	Instance of access to block structure

NOTE!

1. In CFW300 and CFW100, the PT and ET field types can only be WORD or UINT.

2. Some devices allow you to configure user parameters, but these need to be configured for use in the fields PT and ET, where it is necessary to select a compatible data type as shown in table above. For more information refer to the corresponding topic;

3) The TIMEBASE field may vary depending on the device used.

Operation

While the IN input is FALSE, the Q output is FALSE and ET also receives the value zero.

On the edge positive transition in IN, counting is triggered and ET is incremented according to TIMEBASE. When ET equals PT, the Q output goes to state TRUE until IN revolutions to FALSE.

Compatibility

Device	Version
PLC300	1.50 or higher
SCA06	2.00 or higher

Block Flowchart

TON_flowchart

Operation Diagram

hardwaretimerton_fig2

Example in Ladder

TON_example01

The above example shows the initial conditions of the block and of the routine variables.

TON_example02

When activated the IN input, counting is triggered. Since ET equals PT, the Q output is enabled.

TON_example03

Note that a change in PRESET variable is not forwarded to the PT field while the IN entry remains enabled.

TON_example04

Disabling the IN input, the value of PT is updated and the Q output is disabled. When activating it again, counting is triggered.

TON_example05

Disabling the IN input, the value of ET remains saved.

TON_example06

Enabling the IN input, the value of ET is reset and counting is triggered.

TON_example07

When ET reaches the value PT, the Q is output enabled and remains so while IN is at TRUE level.

Example in ST

The example below displays the instructions for applying the example above in the ST language.

VAR

PRESET : UINT := 15;

ELAPSED : UDINT;

TON_INST_0 : FB_TON;

END_VAR

TON_INST_0.IN := DI1;

TON_INST_0(PT:=PRESET, TIMEBASE:=2); // TIMEBASE according to

ELAPSED := TON_INST_0.ET; // the device used

DO1 := TON_INST_0.Q;