Main Pcb; Scale Base; Options; Com2 Serial Port - Mettler Toledo IND131 Guia De Instalacion

1.8.

Main PCB

The IND131/IND331 terminal's main printed circuit board (PCB) provides the analog load cell
scale interface, as well as the COM1 RS-232 serial port.
The main board also contains the power input connection (for either AC or DC supply, depending
on the model), display interfaces (one each for the larger IND331 and smaller IND131 displays), 6
position DIP switch and bus connectors for the PLC and COM2/DIO option boards.
Two LEDs are provided to indicate the operational status of the terminal and a memory card socket
is mounted to the under-side of the PCB to support the optional SD memory.
1.9.

Scale Base

The IND131/IND331 terminals support analog scale bases and provide 5 volts of excitation to drive
analog load cells.
A six wire load cell connection is provided with sense lines to help maintain accuracy as the load
cell cable resistance changes with temperature variations.
1.10.

Options

The following options are available for the IND131/IND331:
•
•
•
1.10.1.

COM2 Serial Port

This optional port provides RS-232 and RS-485 communication at rates from 300 to 115.2k baud.
The port is bidirectional and can be configured for various functions such as demand output,
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COM2/DIO (relay output)
One RS-232/485 serial COM port
Internal, discrete I/O (2 inputs and 4 outputs)
─
Inputs are optically isolated solid state and switch selectable as either active or passive
─
Output relays provide one normally open contact per relay
This option not for use with the IND131xx or IND331xx terminal
COM2/DIO (solid state output)
One RS-232/485 serial COM port
Internal, discrete I/O (2 inputs and 4 outputs)
─
Inputs are optically isolated solid state and switch selectable as either active or passive
─
Outputs are solid state open collector
Programmable Logic Control (PLC) interfaces, including:
4-20mA Analog Output A-B RIO
DeviceNet Ethernet/IP
METTLER TOLEDO IND131/IND131x/IND331/IND331xx Installation Manual
CC-Link ControlNet
ModbusTCP PROFIBUS DP
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