RC version – external drive
SIMDOS diaphragm metering pump
KNF Flodos BA_SIMDOS_EN_02_160044.docx
32
Translation of original operating manual
8.2. Digital input 1, Start/Stop
The pump can be externally started and stopped via digital input 1.
If digital input 1 is active, the pump can be started only via the
digital input.
If analogue control is also set, a valid analogue signal must be
present.
Control signals
Input
Meaning
Signal
Off
Digital input 1 not active
- -
Level
Start/Stop according to
signal level
< 0.8 V = On
> 2.0 V = Off
Pulse
Start/Stop on signal pulse
< 0.8 V = On
> 2.0 V = Off
Tab. 20: Digital input 1 options
After the pump has been stopped, there is a pause time of 0.2
seconds before it can be restarted.
No pulses with a pulse duration of less than 0.1 seconds may
be used.
The use of debounced switches is recommended.
START/STOP in “Pump ml/min without timeout” condition
1. Set digital input 1 “In_1” to Level.
2. Press “START” – the pump goes into “Pause” condition.
3. Apply signal 1. The pump will start to operate if the level is
below 0.8 V, and stop if it is above 2.0 V.
Fig. 49: Level-based Start/Stop control
1. Set digital input 1 “In_1” to Pulse.
2. Press “START” – the pump goes into “Pause” condition.
3. Apply signal 1. The pump will start to operate when a pulse of
less than 0.8 V is generated, and stop on the next pulse of
more than 2.0 V.
Fig. 50: Pulse-based Start/Stop control
System
Fig. 48: Digital input 1
Start/Stop level
Start/Stop pulse
