Electromagnetic flowmeter M910
Operation manual
25
i)
On<F1
output is on, when flowrate is lower than PF1, otherwise it is off.
If setting of flow limit is chosen, hysteresis H can be set too. Hysteresis is a tolerance field on one side of flow
limits PF1 and PF2. The output status changes (indicates crossing over pre-set limit), when the immediate flowrate
crosses over the value PF2 (or goes below limit PF1). The output status comes back to the default status, when the
immediate flowrate decreases under the value PF2-H (or increases over limit PF1+H) again.
Mode d) with non-zero hysteresis:
Mode e) with non-zero hysteresis:
Mode h) with non-zero hysteresis:
Mode i) with non-zero hysteresis:
Following values are pre-set:
Status output standard factory setting:
Mode
„Off “.
PF1
limit corresponds to the required nominal flowrate -Q
N
PF2
limit corresponds to the required nominal flowrate Q
N
H
hysteresis corresponds to the required nominal flowrate Q
N
/10
Parameters PF1, PF2 and H are common for frequency, impulse and status mode.
5.2.1.6
PLC digital input (1.6 INPUT)
Digital input is activated with DC voltage between 5 and 30 V (positive or negative). Digital input is between
terminals 9 and 10.
Digital input can be programmed in one of the following modes:
a)
Off
input is not active.
b)
Dose
input activation starts dose QD measuring. Dosing indication can be performed
by one of outputs (frequency, impulse or status).
c)
Clr.Vol
input activation clears the Auxiliary volume.
QD value represents volume for dosing. QD value can be changed after selecting mode “b”.
Following values are pre-set:
Digital input standard factory setting:
QD
volume 1000 l
Mode
„Off“.
PF1 PF1+H
PF2-H PF2
OFF
ON
PF1 PF1+H
PF2-H PF2
OFF
ON
PF1 PF1+H
OFF
ON
PF1 PF1+H
OFF
ON