Bronkhorst EL-FLOW Prestige - Manual (Page 39)

Bronkhorst High-Tech B.V.
EL-FLOW Prestige 39 9.17.084
4.2.4 Advanced alarm parameters
Bronkhorst digital instruments have a built-in alarm function. It is used to indicate several types of alarm:
System errors
System warnings
Min/max alarms
Response alarms
Batch alarm
Master/slave alarms
The alarm types can be set with the parameter ‘ 118 Alarm Mode’. When an alarm occurs, the type of alarm can be read out using
parameter ‘ 28 Alarm Info’. After an alarm, an automatic setpoint change can be set using the parameters ‘ 120 Alarm Setpoint Mode’
and ‘ 121 Alarm New Setpoint’. It is also possible to set an alarm delay to prevent overreaction to small disturbances using the
parameter ‘ 182 Alarm Delay Time’. How an alarm can be reset is controlled by the parameter ‘ 156 Reset Alarm Enable’. It can bit-wise
be set to automatic, reset, external or keyboard/micro switch. Note: when an alarm is disabled, it will only switch off after the set
‘ 156 Alarm Delay Time’ has passed.
Alarm Mode
Type Access Range FlowDDE FLOW-BUS Modbus
Unsigned char RW 0...3 118 97/3 0x0C23/3108
Available alarm modes:
Value 0: Alarm off
Value 1: Alarm on absolute limits
Value 2: Alarm on limits related to setpoint (response alarm)
Value 3: Alarm when instrument powers-up (e.g. after power-down)
For DeviceNet TM only modes 0 and 1 are available.
Alarm Info
Type Access Range FlowDDE FLOW-BUS Modbus
Unsigned char R 0…255 28 1/20 0x0034/53
This parameter contains 8 bits with status information about (alarm) events in the instrument (convert value to binary number to
see which bits are active).
Bit Low (0) High (1) Description LED indication
0 No error An error occurred Alarm register 2 contains an error On (red) /
normal flash
1 No error A warning occurred Alarm register 1 contains a warning On (red) /
normal flash
2 No error Minimum alarm ‘Measured Value’ < ‘Alarm Minimum Limit’ / Slow wink
3 No error Maximum alarm ‘Measured Value’ > ‘Alarm Maximum Limit’ / Slow wink
4 No error Batch counter alarm Batch counter reached its limit / Slow wink
5 No error This bit only:
Together with bit 2 or 3:
Power-up alarm (probably a power dip
occurred)
Response alarm (too much difference between
‘ 8 Measured Value’ and ‘ 9 Setpoint’)
/ Slow wink
6 No error Master/slave alarm 'Setpoint' out of limits due to ‘Slave Factor’ (>
100%)
N/A
7 No error Hardware alarm Hardware error On (red)
Alarm events