Discrete I/O; Serial Ports; Plc Interfaces - Mettler Toledo IND780 Manual De Instalación

Discrete I/O

The discrete I/O interface options include both internal and remote I/O.
• The internal version is available with dry-contact relay or solid state relay
outputs. Both types will switch up to 30 volts DC or AC and up to 1 amp of
current. The inputs are switch-selectable as either active (for simple pushbutton
control) or passive (for connection to PLCs or other devices that supply their
own power for the I/O). Each internal board supports four inputs and four
outputs.
• The remote I/O is supported with the ARM100 remote module that provides dry-
contact outputs. The inputs are passive on the ARM100. Each ARM100
supports four inputs and six outputs. An external 24-volt DC supply is required
to operate the ARM100.
• A total of two internal Discrete I/O boards (8 inputs and 8 outputs) are
supported and an additional 32 inputs and 48 outputs through a maximum of
eight remote I/O modules.

Serial Ports

Additional communications cards provide RS-232, RS-422 or RS-485
communication at rates from 300 to 115.2k baud. A maximum of two serial
communications cards may be installed in the IND780.

PLC Interfaces

The IND780 PLC interface options include A-B RIO, PROFIBUS
®
EtherNet/IP , DeviceNet™ and Modbus TCP.
A-B RIO
The A-B RIO option enables data exchange by bi-directional communications using
the Discrete Data Transfer or Block Transfer mode. The IND780 Terminal initiates a
communication exchange with the PLC approximately 20 times per second
utilizing the Allen-Bradley Discrete Data Transfer protocol. This communication is a
high-speed, real-time message interface between the IND780 Terminal and the
PLC for process control. Division, integer, and floating point values are supported.
The IND780 A-B RIO interface also supports Block Transfer mode for transmission
of larger amounts of data. Additional details about this interface can be found in
the IND780 PLC Interface Manual on the documentation CD.
PROFIBUS DP
The IND780 Terminal communicates to a PROFIBUS-DP master according to
DIN 19 245. The PROFIBUS option consists of a module, together with firmware
that resides in the IND780 Terminal to implement the data exchange.
IND780 Installation Manual
®
DP, ControlNet™,
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