FB_EDM

Description Function Block

The FB_EDM (External Device Monitor) function block monitors the bMon1 and bMon2 signals over time. Switch-on and switch-off monitoring can be configured. In the default state, both monitors are inactive.

In the case of the switch-on monitoring, it is checked whether the bMon2 signal is set to 0 within the specified time (maximally 10000 ms) on a change of the bMon1 signal from from 0 to 1.

In the case of the switch-off monitoring, it is checked whether the bMon2 signal is set to 1 within the specified time (maximally 10000 ms) on a change of the bMon1 signal from 1 to 0.

The bError output of the function block is set if the set monitoring time is exceeded. This can then be reset via the ErrAck signal of the TwinSAFE group.

Table 10. VAR_INPUT

Name	Data Type	Initial Value	Description, Parameter Values
`bMon1`	`BOOL`	`FALSE`	1st input The Negation command can be used to set whether the input is a normally closed or normally open contact.
`bMon2`	`BOOL`	`FALSE`	2nd input Input, which must adopt the opposite value to input 1 within the set times.
`tSwitchOnMonitoring`	`SAFETIME`	`TIME#0ms`	Switch-on delay
`tSwitchOffMonitoring`	`SAFETIME`	`TIME#0ms`	Switch-off delay

Table 11. VAR_OUTPUT

Name	Data Type	Initial Value	Description, Parameter Values
`bError`	`SAFEBOOL`	`FALSE`	`TRUE`: Switch-on or switch-off times have been exceeded. `FALSE`: No error has occurred.

Name

Data Type

Initial Value

Description, Parameter Values

bError

SAFEBOOL

FALSE

TRUE: Switch-on or switch-off times have been exceeded.

FALSE: No error has occurred.