9.2.7.
Delay time: set
A failure operation is only performed once the delay time has expired. This prevents
a short-term loss of signal, which does not have an effect on the process, from directly
starting a failure operation
Required user level:
Specialist (4)
or higher.
Customer settings M0041
Failure behaviour M0378
Delay time M0386
Default value:
00:03.0 min:s
(3 seconds)
Setting range:
0.0 ... 30:00.00.0 min:s
(30 minutes)
9.3.
EMERGENCY behaviour
Application
The EMERGENCY behaviour can be used to determine the actuator behaviour in
an emergency.
Characteristics
●
The function <EMERGENCY behaviour> is initiated by the EMERGENCY signal.
●
The actuator performs a defined EMERGENCY operation. For example, the
actuator moves to a predefined EMERGENCY position (i.e. end position OPEN
or end position CLOSED).
●
As long as the EMERGENCY signal is present, the actuator does not respond
to any other operation commands (EMERGENCY signal has top priority).
●
After initiating the EMERGENCY behaviour, binary operation commands (via
digital inputs) may have to be sent again.
●
Analogue operation commands (e.g. 0/4 – 20 mA) or operation commands via
fieldbus are immediately executed again.
Perform EMERGENCY operation via fieldbus command
For control via fieldbus interface, the EMERGENCY command is done via fieldbus
command
Fieldbus EMCY
.
Switching behaviour:
●
Fieldbus EMCY
= 1 = EMERGENCY behaviour is initiated.
●
Fieldbus EMCY
= 0 = No EMERGENCY operation
If the EMERGENCY command is not to be transmitted via a fieldbus command but
using a binary signal, (e.g. + 24 V DC) via <Additional inputs> or via an additional
<Parallel interface>, a digital input has to be available and configured.
Configuration of digital input
Required access level:
Specialist (4)
.
Device configuration M0053
I/O interface M0139
Digital inputs M0116
Example
Use input DIN 4 for signal
EMERGENCY
:
Parameter:
Signal DIN 4 M0118
Setting value:
EMERGENCY
(wiring diagram designation:
EMERGENCY
)
Information
The logic for the digital inputs may be inverted. Depending on the parameter setting
(e.g.
Coding DIN 4 M0126
), the input is either
High active
or
Low active
. For safety
reasons, the
EMERGENCY
signal input is generally set to
Low active
.
Perform EMERGENCY operation via digital input
Switching behaviour for coding
Low active
:
●
Input
EMERGENCY
= low level (0 V DC or input open-circuit)
EMERGENCY operation is initiated.
87
Actuator controls
ACV 01.2/ACVExC 01.2 Profibus DP
Failure functions
