Mettler Toledo IND570 Manual De Instalación página 88

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".
30205319 | 11 | 07/2019
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 2-101: Active Input Wiring
METTLER TOLEDO IND570 Terminal Installation Manual 2-55