FB_CS

Description Function Block

The FB_CONNECTION SHUTDOWN function block can be used to deactivate a TwinSAFE connection. When the input of the function block becomes active, the connection is terminated, a shutdown command is sent to the FSoE partner, and a feedback signal is sent to the output. Furthermore, the connection is terminated and the output is set if a shutdown command is received from the communication partner.

The output is not reset until the connection to the FSoE partner is in the DATA state again.

The FSoE Master tries to re-establish the connection or the FSoE Slave replies to the connection again as soon as the input of the function block is no longer active.

This function block is required for modular safety concepts in which machine parts are sometimes installed or not. This functionality is also required for machines in which tool changes are performed.

On the opposite side, the function block is called without connected inputs. The bDeactivated output is set as soon as the connection is terminated due to a shutdown command from the communication partner.

If bDeactivate2 and tDiscTime12 are deleted, then bDeactivate1 is used as a 1-channel input.

Table 6. VAR_INPUT

Name	Data Type	Initial Value	Description, Parameter Values
`bDeactivate1`	`SAFEBOOL`	`FALSE`	1st input channel The Negation command can be used to specify whether a normally closed contact (safe state is requested for logic 0) or a normally open contact (safe state is requested for logic 1) is linked to this input.
`bDeactivate2`	`SAFEBOOL`	`FALSE`	2nd input channel Same behavior as `Deactivate1`. If the discrepancy time `tDiscTime12` is not equal to 0, then the 1st and 2nd input channels are considered to be one input group and the discrepancy time between the two channels is monitored if either of the two input channels requests the safe state.
`tDiscTime12`	`SAFETIME`	`TIME#0ms`	Discrepancy time
`byConnectionId`	`SAFEBYTE`	`0`	ID of the connection (=logical I/O) which should be deactivated. In CODESYS, the connections are numbered in ascending order (starting with the first physical module). This parameter can be set in the Safe configuration dialog of the fieldbus device.

Table 7. VAR_OUTPUT

Name	Data Type	Initial Value	Description, Parameter Values
`bDeactivated`	`SAFEBOOL`	`FALSE`	Output channel The safe state corresponds to logical 0. The output is set when the connection is terminated.
`bError`	`SAFEBOOL`	`FALSE`	`TRUE`: The discrepancy time monitoring of a 2-channel input group has detected an error. The error must be acknowledged via the `ERR_ACK` input of the associated POU (TwinSAFE group). `FALSE`: No error was detected.

Name

Data Type

Initial Value

Description, Parameter Values

bDeactivated

SAFEBOOL

FALSE

Output channel

The safe state corresponds to logical 0. The output is set when the connection is terminated.

bError

SAFEBOOL

FALSE

TRUE: The discrepancy time monitoring of a 2-channel input group has detected an error. The error must be acknowledged via the ERR_ACK input of the associated POU (TwinSAFE group).

FALSE: No error was detected.