SF_TwoHandControlTypeII

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_TwoHandControlTypeII 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 2" function in an application according to the European standard.

Table 37. 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 38. 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 `S_Button1` and `S_Button2` inputs are `TRUE` and no error occurred. Correct two-hand control
`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 73. Function block: SF_TwoHandControlTypeII

Functional description

This FB supports the "two-hand control type 2" function according to the European standard. If S_Button1 and S_Button2 are set to TRUE 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 74. Status diagram: SF_TwoHandControlTypeII

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 75. Timing diagram: SF_TwoHandControlTypeII

Error detection

After activating the FB, setting any pushbutton to TRUE is recognized as an invalid input signal, which leads to an error.

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

Table 39. FB-specific error codes

`DiagCode`	Statue Name	Status description and output setting
`16#C001`	`Error B1`	`S_Button1` was `TRUE` at block activation `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`
`16#C002`	`Error B2`	`S_Button2` was `TRUE` at block activation `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`
`16#C003`	`Error B1&B2`	The signals at `S_Button1` and `S_Button2` were `TRUE` at block activation `Ready = TRUE` `Error = TRUE` `S_TwoHandOut = FALSE`

DiagCode

Statue Name

Status description and output setting

16#C001

Error B1

S_Button1 was TRUE at block activation

Ready = TRUE

Error = TRUE

S_TwoHandOut = FALSE

16#C002

Error B2

S_Button2 was TRUE at block activation

Ready = TRUE

Error = TRUE

S_TwoHandOut = FALSE

16#C003

Error B1&B2

The signals at S_Button1 and S_Button2 were TRUE at block activation

Ready = TRUE

Error = TRUE

S_TwoHandOut = FALSE

Table 40. 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 1 is pressed. `Ready = TRUE` `Error = FALSE` `S_TwoHandOut = FALSE`
`16#8006`	`Button 2 Actuated`	Only Button 2 is pressed. `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`	`LockedOff`	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`