5 System monitoring
Positioner DC 6-06
23
5.2.1
Stop request
A stop request is present when 3802
SystemStopRequest
= 1. This means that either an
externally selected stop signal is active or a fatal system error has occurred (
An external stop signal is selected by 2810
SwitchStopRequest
(
) or 2809
AnaStopRequest
(
5.2.1.2 External stop request by an
). Both signals are of equal value in the program flow: If one of the two
values is present, then the stop request 3802
SystemStopRequest
is active, if both values are
inactive, then 3802
SystemStopRequest
is also deactivated unless a fatal error is present.
5.2.1.1
External stop request by a digital input
A digital stop request is indicated by 2810
SwitchStopRequest
= 1. The assignment of
a certain digital input to this function is described in detail in
This stop request can be executed as high-active or low-active by the software. High-
active means that the stop request is only active when the signal = 1. Low-active
means that the stop request is activated when the signal = 0. The desired signal type
is defined with 4811
DigStopOpenOrClose
.
4811
DigStopOpenOrClose
= 0
Stop request is only active when the switch is
closed
4811
DigStopOpenOrClose
= 1
Stop request is only active when the switch is
open
Parameter 4810
DigStopImplsOrSwitch
can also be used to select whether the stop
will only last for as long as the request itself is active, or whether a one-off switch
impulse is sufficient to activate the stop. In the latter case the stop request is only
terminated when the system is stopped.
4810
DigStopImplsOrSwitch
=
0 Stop request is only active when stop
command is present
4810
DigStopImplsOrSwitch
= 1 A one-off switch impulse keeps the stop
request active until the system stops
Digital inputs are not monitored for errors and must
not be used for safety-related functions as defined by
classification societies
The use of a monitored analogue input instead of a digital
input for the external stop request is therefore possible.
Summary of Contents for PANDAROS DC 6-06
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