Carbolite nanodac - Manual (Page 37)

nanodac™
35
MC27 –EN–1.04
Ch1(2) Holdback Select ‘Off’, ‘Low’, High’, or ‘Band’ (see description in Program details above).
Ch1(2) Holdback Val The value to be used in triggering holdback.
Ch1(2) PV Event Appear only if ‘PV Events’ have been enabled in the Programmer Features menu.
A PV Event (an analogue alarm on the channel PV) is available for each channel in
every segment (excluding Wait and Go Back segment types). The following PV
Events are supported:
Off: The PV Event is disabled
Abs High: The event is triggered when the channel PV exceeds PVEvent Val for the
relevant channel.
Abs Low: Triggered when the channel PV becomes less than PVEvent Val for the
relevant channel.
Dev High: This event is triggered when the channel PV exceeds (PSP + PVEvent
Val) for the relevant channel
Dev Low: Triggered when the channel PV becomes less than (PSP - PVEvent Val)
for the relevant channel.
Dev Band - This event is triggered when the channel PV differs from the PSP by
more than the configured deviation value (either above or below)
In the following example, in segment 1 Ch1 PV Event has been configured as Dev
Band and in segment 2 it has been configured as an Abs low:
Figure 1.4.9g PV Events
Ch1 PVEvent Val Appears only if ‘Ch1 PVEvent’ is not ‘Off’. Sets the level at which Ch1 PV Event
becomes active.
Ch2 PVEvent Val Appears only if ‘Ch2 PVEvent’ is not ‘Off’ and if ‘Channels’ is set to ‘2’ in
Programmer Set Up configuration. Sets the level at which Ch2 PV Event becomes
active.
Ch1 (2) Event Use When PV events become active, they can be used either to Trigger a secondary
process or as a simple analogue alarm on the PV input. Appears only if the relevant
PV Event parameter is not set to ‘Off’.
Ch1 (2) User Val Specifies the User Value for this segment, for channel 1(2). Appears only if ‘User
Value’ has been enabled in the Programmer Features menu.
The example below (from iTools) shows this parameter wired to the trigger 1 input
of the Custom Messages block, so that, if a User value >0 is entered, then every
time the segment runs, Custom message 1 is generated.
Event 1 to 8 The number of Events available (Max Events) is defined in Programmer Set Up
configuration. Enabling an event causes the relevant indicator on the display page
to be illuminated for the duration of the segment. As with ‘User Val’, above,
Events can be wired to the inputs of other parameters if required.
Segment 1 Segment 2
PSP
PV
PVEvent Val
PVEvent
On
Off
= PV Event Val Segment 1
= PV Event Val Segment 2