Mettler Toledo IND570 Manual Del Usuario página 58

2.4.6.3.1. Active Input Wiring
The inputs can be selected as either active or passive via a switch on the board. When active is
selected, an internal 5V DC supply is provided to the inputs so only an external contact closure is
required to turn an input "on".
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2-28 METTLER TOLEDO IND570 Weighing Terminal Installation Manual
Notes for Active Input Discrete I/O wiring:
Voltage is logic level 5 VDC. Low resistance contacts recommended.
The two IN COM terminals are connected internally on the DI/O pcb so either IN COM can be
utilized during installation. Two IN COMS are provided as a convenience for installations
where external switches/contacts are not located together and multiple commons require wire
termination.
Maximum cable length of 20 feet (6 meters)
Do not bundle input wiring with power wiring or any other high energy cables
Switches may be replaced with relay dry contacts
Wire sizes: 22 AWG min./ 14 AWG max.
Figure 2-41: Active Input Wiring
30205319 | 04 | 08/2016