Flintec II IPC - Manual (Page 10)

FlintWeigh II IPC Technical Manual, Rev. 1.06 November 2011 Page 10 of 36
4.2. Important Information about the Operation of Digital Load Cells
It is allowed to connect up to 16 digital load cells (e.g. type RC3D) to the weighing system controller.
The integrated power supply can provide electrical power for up to 8 digital load cells.
IMPORTANT: If you connect more than 8 digital load cells, then it is mandatory to power all load cells from an
external power supply.
External power supply for digital load cells
The external power supply has to provide a stabilized +12 V DC / ±5% with at least 1.5 A current. The input
goes directly to the connection cable of the digital load cells. Only the pins "RS485 A", "RS485 B" and "GND"
will be connected with the weighing system controller.
Fig. 4.4: Schematic of the external power supply to the digital load cells
4.3. Information about the Digital Inputs / Outputs
The digital I/O connections (one input, two outputs) can be used connecting e.g. a traffic light, a gate or a
switch-key.
Digital output:
2x, open collector (max. 24 V DC, max. 50 mA)
Digital input: 1x, opto-isolated, 3...24 V DC, max. 20 mA; min. switching current = 1,5 mA
Fig. 4.5 : Wiring example for the digital I/O
Pin 6
Pin 2
Pin 1
Pin 5
Pin 7
Pin 8