6
POWER-UP
Upon switching on the power to the unit, all displays and indicators are lit on for approximately 3 seconds during which time the
Scanner runs a self initialization sequence.
MAIN DISPLAY MODE
After the self initialization sequence, the Scanner enters MAIN Display Mode. The PV Readout starts showing the measured
PV (Process value) with the corresponding channel number being shown on the Channel No. Readout. The MAIN Display
Mode is one that shall be used most often.
The Scanner may be configured to operate in either Auto or Manual Scan Mode. The Power-on default mode is ‘Auto Scan
Mode’. Use front panel key ‘A/M’ to toggle between the Auto and Manual Scan Mode.
Auto Scan Mode
In this mode, the Scanner shows the Process Value for each channel sequentially at a periodic interval, called ‘Scan Rate’.
The Scan Rate is user settable from 1 to 99 seconds. The channels are displayed in ascending (increasing) order with the last
channel automatically rolling over to the first channel. In Auto Scan Mode, the front indicator marked ‘MANUAL’ remains OFF.
Manual Scan Mode
In this mode, the Scanner keeps displaying the Process Value for the selected channel indefinitely. The user can switch to and
hold any desired channel by using UP/DOWN keys. In Manual Scan Mode, the front indicator marked ‘MANUAL’ is lit ON.
ALARM SYSTEM
There are up to 4 soft Alarms (AL-1 to AL-4) available for each channel.
Status Indication
There are 16 front panel Alarm Status LEDs, one for each channel. If any one or more set Alarm for a channel is active, the
corresponding front panel indicator flashes.
Relay Activation & Acknowledge
The 4 Relay Outputs (RLY-1 to RLY-4) are mapped with the 4 Alarms (AL-1 to AL-4) as explained below in Table 3.1.
User Manual
SCANEX PLUS
Section 3
BASIC OPERATION
Output
Relay Activation
RLY-1
If Alarm-1 for any one or more channels is ON
If Alarm-2 for any one or more channels is ON
If Alarm-3 for any one or more channels is ON
If Alarm-4 for any one or more channels is ON
Associated Alarm
AL-1
RLY-2
AL-2
RLY-3
AL-3
RLY-4
AL-4
Table 3.1
The front panel Alarm Ack/View key is used to mute the
Audio Alarm
or to bring the system out of
Trip Condition
. The effect of
acknowledge function depends both on the Relay Logic (Direct / Reverse) and Latched / Un-Latched operation. Note that
Acknowledging the alarm only de-activates the relay output and does not remove the Alarm condition. Refer Table 3.2 for
effect of Acknowledge Key.