Pilz PNOZ mm0p 24VDC - Manual (Page 93)

Modbus/TCP
Operating Manual PNOZmulti communication interfaces
1001154-EN-13
93
Modbus/TCP
System requirements
} PNOZmulti Configurator: From Version 7.1.0
} All base units and modules that have an Ethernet interface (exception: PNOZ m1p ETH
from V2.1)
Please contact Pilz if you have an older version.
Modbus/TCP - Basics
Modbus/TCP is an open fieldbus standard published by the User Group MODBUS-IDA (see
www.Modbus-IDA.org).
Application Layer
Protocol
Modbus/TCP
TCP
(RFC 793)
IP
(RFC 791)
Industrial Ethernet
Physical Layer
Ethernet
Modbus/TCP is a protocol based on Industrial Ethernet (TCP/IP over Ethernet). It is one of
the protocols with Client/Server communication. Data is transferred via a request/response
mechanism using function codes (FC).
Modbus/TCP is connection-oriented, i.e. before usable data is transferred via Modbus/TCP,
a connection must first be established between two Modbus/TCP interfaces. The initiator of
the connection is called the Client. The communications partner with which the Client es-
tablishes the connection is called the Server. Whether a connection on a device assumes
the role of Client or Server is defined when a connection is configured. As a result, the
Server/Client role only applies for that specific connection.
6
6.1
6.2