HA243820
Issue 5 Mar 98
Section 3
Page 3 - 15
MODEL 346 INSTALLATION AND OPERATION MANUAL
3.3 OPERATION (Cont.)
SINGLE CHANNEL DISPLAYS
Single channel displays show the channel descriptor, the channel number, the units-of-measure, the global
alarm symbol and up to four individual alarm indication symbols.
Single-channel displays scroll to the next channel every 12 seconds. Operation of the ENTER key causes this
scrolling to stop holding that particular display until another key is operated.
There is a single-channel display for every input or derived variable (DV) channel (unless the Linearisation
Function or Source DV choice is OFF).
The up or down arrow keys step through the single-channel displays.
Operation of the Clear key causes a return to the first multi-channel display.
3.3.2 ALARMS
An Instrument alarm (inverse video 'I') appears flashing after initialisation. If this 'I' continues to flash for more
than 90 seconds, section 6.2 of this document should be referred to for Instrument Alarm information.
The global alarm bell symbol appears flashing whenever any alarm on any channel becomes active. The bell
continues to flash until all alarms have cleared.
On multi-channel displays, the alarm channel number also flashes. On single-channel displays, there are four
alarm indicator positions in the upper right corner. The symbols which appear there depend on the types of
Alarm that are currently active on that channel. The possible symbols and their interpretations are as follows:
∧
Absolute high
∨
Absolute low
↑
Rate-of-change rising
↓
Rate-of-change falling
| ←
Deadband (deviation)
Ch Descriptor
ChN value units
I