Group Parameters for the Digital Part

Name	Value	Internal value	Internal value, type	Default
Input delay	0.1 ms 1 ms 8 ms 32 ms	0 1 2 3	BYTE	0.1 ms 0x00
Detect short circuit at outputs	Off On	0 1	BYTE	On 0x01
Behavior DO at comm. error 1)	Off Last value Last value 5 sec Last value 10 sec Substitute value Substitute value 5 sec Substitute value 10 sec	0 1 6 11 2 7 12	BYTE	Off 0x00
Substitute value at output	0 … 65535	0000h … FFFFh	WORD	0 0x0000
Preventive voltage feedback monitoring for DC0..DC7 2)	Off On	0 1	BYTE	Off 0x00
Detect voltage overflow at outputs 3)	Off On	0 1	BYTE	Off 0x00

Remarks:

1)	The parameter Behavior DO at comm. error is applied to DC and DO channels and only analyzed if the failsafe mode is ON.
2)	The state “externally voltage detected” appears if the output of a channel DC0..DC7 is to be switched on while an external voltage is connected.  In this case, start-up is disabled while the externally voltage is connected. The monitoring of this state and the resulting diagnosis message can be disabled by setting the parameters to “OFF”.
3)	The error state “voltage overflow at outputs” appears if external voltage at digital outputs DC0..DC7 and DO0..DO7 has exceeded the process supply voltage UP3 (see Electrical Connection CI582-CN). The according diagnosis message “Voltage overflow on outputs ” can be disabled by setting the parameters to “OFF”. This parameter should only be disabled in exceptional cases as voltage overflow may produce reverse voltage.