SF_MutingPar_2Sensor

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_MutingPar_2Sensor 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

Muting is the deliberate suppression of a safety function. Parallel muting with two muting sensors is specified in this block.

Table 64. VAR_INPUT

Name	Data Type	Initial Value	Description, parameter values
`Activate`	`BOOL`	`FALSE`	General input parameters
`S_AOPD_In`	`SAFEBOOL`	`FALSE`	Variable `OSSD` signal from `AOPD`. `FALSE`: Protection field interrupted. `TRUE`: Protection field not interrupted.
`S_MutingSwitch11`	`SAFEBOOL`	`FALSE`	Variable Status of muting sensor `MutingSwitch11`. `FALSE`: `MutingSwitch 11` not actuated. `TRUE`: Workpiece actuates `MutingSwitch11`.
`S_MutingSwitch12`	`SAFEBOOL`	`FALSE`	Variable. Status of muting sensor `MutingSwitch12`. `FALSE`: `MutingSwitch 12` not actuated. `TRUE`: Workpiece actuated `MutingSwitch 12`
`S_MutingLamp`	`SAFEBOOL`	`FALSE`	Variable or constant. Shows the state of the muting lamp. `FALSE`: Muting lamp faulty `TRUE`: Muting lamp not faulty.
`DiscTimeEntry`	`TIME`	`T#0s`	Constant 0..4 s; Maximum discrepancy time for `S_MutingSwitch11` and `S_MutingSwitch12` The "DiscTimeEntry and MaxMutingTime" caution note must be observed.
`MaxMutingTime`	`TIME`	`T#0s`	Constant `0 .. 10 min`. Maximum time for complete muting sequence, timer is started when the first muting sensor is actuated. The "DiscTimeEntry and MaxMutingTime" caution note must be observed.
`MutingEnable`	`BOOL`	`FALSE`	Variable or constant. Command of the control system which activates the start of the muting function when required by the machine cycle. After starting the muting function, this signal can be switched off. `FALSE`: Muting not active `TRUE`: Start of the muting function activated.
`S_StartReset`	`SAFEBOOL`	`FALSE`	General input parameters
`Reset`	`BOOL`	`FALSE`	General input parameters

DiscTimeEntry and MaxMutingTime

For developers in Extended Level: The DiscTimeEntry and MaxMutingTime inputs have to be set to constant values. This means that these values must not be changed for the calls.

Table 65. VAR_OUTPUT

Name	Data Type	Initial Value	Description, parameter values
`Ready`	`SAFEBOOL`	`FALSE`	General output parameters
`S_AOPD_Out`	`SAFEBOOL`	`FALSE`	Safety-oriented output, indicates the status of the non-isolating guard of the muting application. `FALSE`: `AOPD` protection field is interrupted and muting is not active. `TRUE`: `AOPD` protection field is not interrupted or muting is active.
`S_MutingActive`	`SAFEBOOL`	`FALSE`	Displays the status of the muting process. `FALSE`: Muting not active `TRUE`: Muting active
`Error`	`BOOL`	`FALSE`	General output parameters
`DiagCode`	`WORD`	`16#0000`	Diagnostic codes

Important

Line control of the muting sensor signals must be active in the safety loop.

Figure 91. Function block: SF_MutingPar_2Sensor

Functional description

Muting is the deliberate suppression of a safety function. This is necessary, for example, when material is to be transported into the hazardous area without causing the machine to stop. Muting is triggered by a muting sensor. The use of two muting sensors and the correct integration into the production process has to ensure that no person enters the hazardous area while the light grid is muted. Muting sensors can be proximity switches, photoelectronic barriers, limit switches, etc. which do not have to be fail-safe. Active muting mode has to be indicated by indicator lamps.

There are sequential and parallel muting methods. Parallel muting with two muting sensors is used in this block. An example is given below. The positioning of the sensors should be done according to IEC standards. The FB can be used in both directions: forward and backward. In this case, the current direction cannot be determined. Muting should be activated with the MutingEnable signal of the process control to prevent tampering.

The input parameters of the function block contain the signals of the 2 muting sensors (S_MutingSwitch11 and S_MutingSwitch12), the OSSD signal of the "active opto-electronic protective device" S_AOPD, as well as the two parameterizable times DiscTimeEntry and MaxMutingTime.

Caution

The S_StartReset input shall only be activated if it is ensured that no hazardous situation can occur when the S-PLC is started.

Table 66. Example of SF_MutingPar in forward direction with 2 light barriers

No.	Image	Explanation
1		When retroreflective sensors are used as muting sensors, they are generally arranged diagonally. In general, this arrangement of retroreflective sensors as muting sensors requires only two photoelectric sensors and only `S_MutingSwitch11 (MS_11)` and `S_MutingSwitch12 (MS_12)` are assigned.

Status diagram

Figure 92. Status diagram: SF_MutingPar_2Sensor

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 93. Typical time diagram SF_MutingPar_2Sensor (S_StartReset = TRUE, Reset = FALSE, S_MutingLamp = TRUE)

. Muting conditions

Muting condition 1 (to 16#8011) (MS_11 is the first actuated input sensor) Start timer DiscTimeEntry and MaxMutingTime:
MutingEnable AND R_TRIG at MS_11 AND NOT MS_12
Muting condition 2 (to 16#8311) (MS_12 is the first actuated input sensor): Start timer DiscTimeEntry and MaxMutingTime:
MutingEnable AND NOT MS_11 AND R_TRIG at MS_12
Muting condition 3 (from 16#8011 to 16#8012) (MS_12 is the second actuated input sensor): Stop timer DiscimeEntry:
MutingEnable AND MS_11 AND R_TRIG at MS_12
Muting condition 4 (from 16#8311 to 16#8012) (MS_11 is the second actuated input sensor): Stop timer DiscTimeEntry:
MutingEnable AND R_TRIG at MS_11 AND MS_12
Muting condition 5 (from 16#8000 to 16#8012) (both sensors actuated in the same cycle): Start timer MaxMutingTime:
MutingEnable AND R_TRIG at MS_11 AND R_TRIG at MS_12
Muting condition 6 (from 16#8012 to 16#8000) (both sensors resolved in the same cycle or MS_11 and MS_12 resolved one after the other). Stop timer: MaxMutingTime: NOT MS_11 OR NOT MS_12

. Incorrect muting sequences

State 16#8000:(R_TRIG at MS_11 AND MS_12 AND NOT R_TRIG at MS_12) OR
(R_TRIG at MS_12 AND MS_11 AND NOT R_TRIG at MS_11) OR
((MS_11 AND NOT R_TRIG at MS_11) AND (MS_12 AND NOT R_TRIG at MS_12)) OR
(NOT MutingEnable AND R_TRIG at MS_11) OR
(NOT MutingEnable AND R_TRIG at MS_12)
State 16#8011: NOT MutingEnable OR NOT MS_11
State 16#8311: NOT MutingEnable OR NOT MS_12
State 16#8012: all possible transitions allowed

Error detection

The FB detects the following error conditions:

DiscTimeEntry was set to a value less than T#0s or greater than T#4s.
MaxMutingTime was set to a value less than T#0s and greater than T#10min.
The discrepancy time for the pair S_MutingSwitch11/S_MutingSwitch12 was exceeded.
The muting function (S_MutingActive = TRUE) exceeds the maximum time MaxMutingTime.
The muting sensors S_MutingSwitch11, MutingSwitch12 were actuated in the wrong order.
The muting sequence starts without activation by MutingEnable.
Static signals of the muting sensor
A faulty muting lamp is indicated by S_MutingLamp = FALSE.
A static reset condition is detected in status 8001 and 8003.

Error behavior

In case of an error event, the outputs S_AOPD_Out and S_MutingActive are set to FALSE. The DiagCode ouput displays the relevant error code and the Error output is set to TRUE.

FB-Specific Error and Status Codes

Table 67. FB-specific error codes

`DiagCode`	Statue Name	Status description and output setting
`16#C001`	`Reset Error 1`	Static reset condition detected after block activation in status `16#8001` `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = TRUE`
`16#C002`	`Reset Error 2`	Static reset condition detected in status `16#8003` `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = TRUE`
`16#C003`	`Error Muting Lamp`	Error detected with muting lamp `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = TRUE`
`16#CYx4`	`Error Muting sequence`	Error in muting sequence in status `16#8000,16# 8011, 16#8311` `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = TRUE` `Y` = Status in the sequence `16#C0x4` = Error occurs in status `16#8000`. `16#C1x4` = Error occurs in status `16#8011`. `16#C2x4` = Error occurs in status `16#8311`. `16#CFx4` = Muting Enable missing `x` = status of the sensor when an error occurs (4 bits: `LSB = MS_11`; besides `LSB = MS_22`).
`16#C005`	`Parameter Error`	`DiscTimeEntry` or `MaxMutingTime` value out of range. `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = TRUE`
`16#C006`	`Error timer MaxMuting`	Timing error: Active muting time (if `S_MutingActive = TRUE`) exceeds `MaxMutingTime`. `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = TRUE`
`16#C007`	`Error timer Entry`	Timing error: Discrepancy time for switching `MutingSwitch11` and `MutingSwitch12` from `FALSE` to `TRUE` is greater than `DiscTimeEntry` `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = TRUE`

Table 68. FB-specific status codes

`DiagCode`	Statue Name	Status description and output setting
`16#0000`	`Idle`	The function block is not active (basic state). `Ready = FALSE` `S_AOPD_Out =FALSE` `S_MutingActive = FALSE` `Error = FALSE`
`16#8000`	`AOPD Free`	Muting not active and no safety requirement from AOPD. If the timers of the following muting are still running, then they will be stopped. `Ready = TRUE` `S_AOPD_Out = TRUE` `S_MutingActive = FALSE` `Error = FALSE`
`16#8001`	`Init`	The block has been activated. `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = FALSE`
`16#8002`	`Safety Demand AOPD`	Safety request detected by `AOPD`, muting not active. `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = FALSE`
`16#8003`	`Wait for Reset`	Safety requirement or error was discovered and is now cleared. Operator confirmation with `Reset` requested. `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = FALSE`
`16#8005`	`Safe`	Safety function activated `Ready = TRUE` `S_AOPD_Out = FALSE` `S_MutingActive = FALSE` `Error = FALSE`
`16#8011`	`Muting Start 1`	Muting sequence is in start phase after rising trigger edge of `MutingSwitch11` in the start phase; monitoring of `DiscTimeEntry` is activated. `Ready = TRUE` `S_AOPD_Out = TRUE` `S_MutingActive =FALSE` `Error = FALSE`
`16#8311`	`Muting Start 2`	Muting sequence is in start phase after rising trigger edge of `MutingSwitch12`. Monitoring of `DiscTimeEntry` is activated. `Ready = TRUE` `S_AOPD_Out = TRUE` `S_MutingActive =FALSE` `Error = FALSE`
`16#8012`	`Muting Active`	Muting sequence is active, either: After a rising trigger edge of the second input `MutingSwitch12` or `MutingSwitch11` has been detected or If both `MutingSwitch11` and `12` were actuated in the same cycle. Monitoring of `DiscTimeEntry` is stopped. Monitoring of `MaxMutingTime` is activated. `Ready = TRUE` `S_AOPD_Out = TRUE` `S_MutingActive = TRUE` `Error = FALSE`