Plc Interfaces - Mettler Toledo IND560x Manual De Instalación

transmission baud rates of 4,800 Baud or less may result in continuous data lagging behind real
time conditions, or a delayed response to on-demand data requests (e.g., SICS requests).
1.13.3.

PLC Interfaces

The IND560x terminal requires the use of the ACM500 module in the safe area to provide a PLC
interface. Interfaces supported include Analog Output, A-B RIO, DeviceNet, EtherNet/IP, Modbus TCP
and PROFIBUS DP.
Additional details on these interfaces can be found in the IND560 PLC Interface Manual on the
IND560x Documentation CD.
1.13.3.1. Analog Output
Analog Output refers to the representation of an internal system variable using a proportional
electrical signal. Analog Output can be used to transmit a measured value, such as the gross or net
weight or a rate. Another use for the Analog Output is as a control signal for some external device,
such as a control valve, where the amount of valve opening is proportional to the analog signal
commanding its operation. Such outputs are usually used to control the flow rate of material into or
out of a vessel.
Both 0-10 volt DC and 4-20 mA signals are provided. Only one signal can be used at a time.
1.13.3.2. Allen-Bradley (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 terminal provides 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 terminal and the PLC
for process control. Division, integer, and floating point values are supported.
The A-B RIO interface also supports Block Transfer mode for transmission of larger amounts of
data.
1.13.3.3. DeviceNet
DeviceNet is an RS-485 based network utilizing CAN chip technology. The network can be
configured to run up to 500Kbits per second depending on cabling and distances. Messages are
limited to 8 un-fragmented bytes. The network is capable of supporting up to 64 nodes including
the master, commonly called the scanner.
1.13.3.4. EtherNet/IP
EtherNet/IP, short for "EtherNet Industrial Protocol," is an open industrial networking standard that
takes advantage of commercial, off-the-shelf EtherNet communication chips and physical media.
This networking standard supports both implicit messaging (real-time I/O messaging) and explicit
messaging (message exchange). The protocol is supported by ControlNet International (CI), the
Industrial Ethernet Association (IEA) and the Open DeviceNet Vendor Association (ODVA).
1.13.3.5. Modbus TCP
Modbus/TCP is used to establish master-slave/client-server communication between intelligent
devices. It is an open standard network protocol, widely used in the industrial manufacturing
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