SF_TwoHandControlTypeIII

Tip

The version of the function block as described here corresponds to the latest version of the function block in Version list of function blocks.

Applicable safety standards

SF_TwoHandControlTypeIII is a certified PLCopen function block. For detailed information about applied standards, see "PLCopen – Technical Committee 5 – Safety Software".

Important

The requirements listed in the standards must be fulfilled by the user.

Interface description

This function block supports the "two-hand control type 3" function in an application according to the European standard.

Table 41. VAR_INPUT

Name	Data Type	Initial Value	Description, parameter values
`Activate`	`BOOL`	`FALSE`	General input parameters
`S_Button1`	`SAFEBOOL`	`FALSE`	Variable Input for button 1 (for category 3 or 4: two antivalent contacts) `FALSE`: Button 1 is released. `TRUE`: Button 1 is pressed.
`S_Button2`	`SAFEBOOL`	`FALSE`	Variable Input for button 2 (for category 3 or 4: two antivalent contacts) `FALSE`: Button 2 is released. `TRUE`: Button 2 is pressed.

Name

Data Type

Initial Value

Description, parameter values

Activate

BOOL

FALSE

General input parameters

S_Button1

SAFEBOOL

FALSE

Variable

Input for button 1 (for category 3 or 4: two antivalent contacts)

FALSE: Button 1 is released.

TRUE: Button 1 is pressed.

S_Button2

SAFEBOOL

FALSE

Variable

Input for button 2 (for category 3 or 4: two antivalent contacts)

FALSE: Button 2 is released.

TRUE: Button 2 is pressed.

Table 42. VAR_OUTPUT

Name	Data Type	Initial Value	Description, parameter values
`Ready`	`BOOL`	`FALSE`	General output parameters
`S_TwoHandOut`	`SAFEBOOL`	`FALSE`	Safety-oriented output signal `FALSE`: No correct two-hand control `TRUE`: The inputs `S_Button1` and `S_Button2` changed from `FALSE` to `TRUE` within `500 ms` and no error occurred. Two-hand control was performed correctly.
`Error`	`BOOL`	`FALSE`	General output parameters
`DiagCode`	`WORD`	`16#0000`	Diagnostic codes

Tip

No Reset input or error output is required, because no test can be performed on either switch.

Figure 76. Function block: SF_TwoHandControlTypeIII

Functional description

This FB supports the "two-hand control type 3" function according to the European standard. If S_Button1 and S_Button2 are set to TRUE within 500 ms and in the correct sequence, then the S_TwoHandOut output is also set to TRUE. The FB also checks the release of both buttons before the S_TwoHandOut output is set to TRUE again.

Status diagram

Figure 77. Status diagram: SF_TwoHandControlTypeIII

Tip

Note: The transition from any state to the Idle state, initiated by Activate = FALSE, is not shown. In every case, these transitions have the highest priority.

Typical timing diagram

Figure 78. Timing diagram: SF_TwoHandControlTypeIII

Error detection

After activating the FB, any pushbutton set to TRUE is recognized as an invalid input signal, which leads to an error. The device detects when the two input signals have a divergence greater than 500 ms.

Error behavior

In case of an error event, the S_TwoHandOut output is set to FALSE and remains in this safe state. The error state is exited when both pushbuttons are released (set to FALSE).

FB-specific error and status codes

Tip

Note: The transition from any state to the Idle state, initiated by Activate = FALSE, is not shown. In every case, these transitions have the highest priority.

Table 43. FB-specific error codes

`DiagCode`	Statue Name	Status description and output setting
`16#C001`	`Error 1 B1`	`S_Button1` was `TRUE` at block activation `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`
`16#C002`	`Error 1 B2`	`S_Button2` was `TRUE` at block activation `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`
`16#C003`	`Error 1 B1&B2`	The signals at `S_Button1` and `S_Button2` were `TRUE` at block activation `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`
`16#C004`	`Error 2 B1`	`S_Button1` was `FALSE` and `S_Button 2` was `TRUE` after `500 ms` in status `8005` `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`
`16#C005`	`Error 2 B2`	`S_Button1` was `TRUE` and `S_Button2` was `FALSE` after `500 ms` in status `8005` `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`
`16#C006`	`Error 2 B1& B2`	`S_Button1` was `TRUE` and `S_Button2` was `TRUE` after `500 ms` in status `8005` or `8006`. This status is only possible when the states of the inputs `(S_Button1` and `S_Button2`) change from divergent to convergent (both `TRUE`) simultaneously when the timer is running in the same cycle `(500 ms`). `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`

Table 44. FB-specific status codes (no error)

`DiagCode`	Statue Name	Status description and output setting
`16#0000`	`Idle`	The function block is not active (basic state). `Ready = FALSE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8000`	`Buttons Actuated`	Both buttons correctly activated. The safety-oriented output is activated. `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = TRUE`
`16#8001`	`Init`	Block is active, but in base state `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8004`	`Buttons Released`	No button is pressed `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8005`	`Button 1 Actuated`	Only Button a is pressed. Start Monitoring Timer. `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8006`	`Button 2 Actuated`	Only Button 2 is pressed. Start Monitoring Timer. `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8007`	`Button 2 Released`	The safety-oriented output was activated and deactivated again. `FALSE` at both inputs `S_Button1` and S_Button2 was not reached after deactivation of the safety-oriented output. In this state, `S_Button1 = TRUE` and `S-Button2 = FALSE` after deactivation of the safety-oriented output. `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8008`	`Button 1 Released`	The safety-oriented output was activated and deactivated again. `FALSE` at both inputs `S_Button1` and `S_Button2` was not reached after deactivation of the safety-oriented output. In this state, `S_Button1 = FALSE` and `S_Button2 = TRUE` after deactivation of the safety-oriented output. `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8009`	`Locked Off`	The safety-oriented output was activated and deactivated again. `FALSE` at both inputs `S_Button1` and `S_Button2` was not reached after deactivation of the safety-oriented output. In this state, `S_Button1 = TRUE` and `S_Button2 = TRUE` after deactivation of the safety-oriented output. `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8019`	`LockedOn`	Incorrect operation of the buttons. Wait for both buttons to be released. `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`