BASI
Electromagnetic flowmeter
BF
M921
Operation manual
29
Mode i) with non-zero hysteresis:
5.1.4.2
Error mask
The Mask allows selecting which errors will be
reported via the Status Output. Mask value is
calculated as sum of bit values all enabled errors.
Bit value of available errors is in the table:
Bit
Bit value
Error
D0
1
Internal error
D1
2
Excitation overload
D2
4
Empty pipe
D3
8
Temperature out
D4
16
Frequency over
D5
32
Flowrate over
D6
64
Current open
D7
128
Datalogger full
Table 11 : Error mask
Note:
Error Mask should be set to value 255 to report all error messages. This is sum of all error’s bit values. Error
Mask 128 means that only the “Current open” error will be reported via the Status Output. The Status Output
should be set to the mode j) “Error on” or mode k) “Error off”.
5.1.5
PLC digital input
Digital input is activated with DC voltage between 5 and 30 V (positive or negative). Digital input should be
connected between terminals IN1 and IN2.
Note:
PLC digital input is galvanically isolated from other electronic circuits.
5.1.5.1
Mode
Digital input can be programmed in one of the following modes:
a)
Off
input activation does nothing.
b)
Start dose
input activation starts dose volume measuring. Dosing indication can be
performed by one of outputs (frequency, impulse or status).
c)
Clear aux. volume
input activation clears the Auxiliary volume.
d)
Clear all volumes
input activation clears all volumes.
e)
State out on
input sets status output to on state.
f)
State out off
input sets status output to off state.
g)
State out toggle
input toggles status output state.
h)
Empty Pipe
input activation invokes error Empty Pipe. Flowrate is zeroed and volume
counters are stopped in this state.
5.1.6
Limits
Function enables user to set values PF1, PF2 and H. These limits define basic conditions for all digital outputs.
Values are common for Frequency, Pulse and Status outputs
5.1.6.1
Low flowrate limit (LIMIT PF1)
Value is flowrate expressed in selected flowrate units. Available range is according to the nominal diameter.
PF1 PF1+H
OFF
ON
