Specifications
Introduction
22
EIO0000000051 6/2010
Introduction to Ethernet Connectivity
Introduction
The STB NIP 2311 Dual Port Ethernet Modbus TCP/IP NIM allows the Advantys
STB island to function as a node on an Ethernet LAN.
Ethernet is an open local (communications) network that enables the inter-
connectivity of all levels of manufacturing operations from the plant’s office to the
sensors and actuators on its floor.
Conformance
The STB NIP 2311 module is located on a 100Base-T LAN. The 10/100Base-T
standard is defined by the IEEE 802.3 Ethernet specification. Contention for
10/100Base-T networks is resolved by using Carrier Sense Multiple Access with
Collision Detection (CSMA/CD).
Transmission Rate
An STB NIP 2311 island node resides on a baseband network with a transmission
rate of 10 or 100 Mbit/s.
Frame Format
The STB NIP 2311 module supports both Ethernet II and IEEE 802.3 frame formats.
(Ethernet II is the default frame type.)
Modbus over TCP/IP Connection Management
The STB NIP 2311 module supports up to 16 simultaneous Modbus client
connections. If a request for a new connection is received and the number of existing
connections is at the limit, the oldest unused connection is closed.