Bronkhorst®
Instruction Manual EL-FLOW® Prestige
9.17.084N
44
4.2.4
Alarms
Alarm settings are most easily accessible using FlowPlot or FlowView or a Bronkhorst® readout and control unit.
The built-in alarm functionality can be used to handle different alarm types:
·
system errors and warnings
·
min/max alarms
·
response alarms
·
batch alarms
·
master/slave alarms
The used alarm type can be set with parameter
Alarm Mode
. When an alarm is activated, the type can be read out using
parameter
Alarm Info
. An automatic setpoint change can be set using the parameters
Alarm Setpoint Mode
and
Alarm New
Setpoint
. It is also possible to set an alarm delay, to prevent overreaction to small disturbances, using parameter
Alarm Delay
Time
. The methods by which an alarm can be reset are controlled by
Reset Alarm Enable
.
Alarm Mode
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
0…3
118
97/3
0x0C23/3108
Available modes:
Value
Description
0
Alarm off
1
Alarm on absolute limits
2
Alarm on limits related to setpoint (response alarm)
3
Alarm at power-up(e.g. after power-down)
(On DeviceNet™ instruments, 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 provides information about the event type(s) that triggered an alarm situation. The value is a bitwise
summation of the issued alarm types; convert the value to binary to see which types are issued. The following alarm types
can be issued:
Bit
Value
Type
Description
0
1
Error
Error flag raised
1
2
Warning
Warning flag raised
2
4
Minimum alarm
Measure
<
Alarm minimum limit
3
8
Maximum alarm
Measure
>
Alarm maximum limit
4
16
Batch counter alarm
Batch counter reached its limit
5
32
·
This bit only: Power-up alarm
Alarm possibly caused by a power dip
·
If combined with bit 2 or 3:
Response alarm
Difference between
Measure
and
Setpoint
too big
6
64
Master/slave alarm
Setpoint out of limits (caused by
Slave factor
)
7
128
Hardware alarm
Hardware error
Alarm Delay Time
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
0…255
182
97/7
0x0C27/3112
This value represents the time in seconds the alarm action will be delayed when an alarm limit has been exceeded. This
value also delays the alarm off action if an alarm limit is no longer exceeded.
Default value = '0'.