Wiring Connections For Digital I/O Options - Mettler Toledo IND9D56 Guia De Instalacion

IND9D56 Installation Manual
Wiring Connections for Digital I/O
Options
24 VDC Inputs and Outputs
For low voltage DC Inputs and Outputs, LED indicating terminal blocks will be
provided for convenience. These blocks have two terminal levels associated with
them. The top terminals are the actual I/O connection. The lower set of terminals is
the 0V (also known as 24V Return). When 24VDC is applied to that I/O point, the
LED will illuminate. This feature facilitates diagnosis of photoeyes and output
circuits.
Terminal Blocks used for Digital I/O will be labeled using the following convention:
X-Y
where
X = I for Input; O for Output
Y is the IND560 Local I/O Point
For example, a 24VDC photo eye input will always be labeled I-1.
Line Voltage Inputs
Inputs that are at line voltage (110-240VAC) will be terminated directly to an
isolation block, shown in Figure 2-6.
The switched AC pole (L1) would be wired to the even numbered field terminal that
corresponds to the channel. For example, a high voltage entrance photo eye would
be wired to Terminal #2. The AC return (N or L2) would be wired to terminal #3.
2-6
Figure 2-6: Line Voltage Input Isolation Block