Installation and Operation Manual
X-DPT-DeviceNet-SLA5800-SLAMf-Series-RevB-PC-eng
Part Number: 541B200AAG
March, 2015
102
Section 8 - Glossary
Brooks DeviceNet PCs
MAC ID
The Media Access Control Identifier, more commonly knows as the network
address of the device. Setting the MAC ID switches found on the top cover of
the SLA5800/SLAMf Series PC/PM will configure this address. The range of
addresses is 0 to 63.
Master/Slave
Master/Slave refers to the relationship between one controlling device
(Master) and one or more subordinate devices (Slaves). This is a typical
application of a DeviceNet network where the Master has the capability to
establish Connections with more than one Slave. The (Master) then sends to
each Slave control data and receives from each (Slave) device status and/or
operational data. An example would be a (Master) device sending a setpoint
to one or more pressure controllers (Slaves), and each controller would
respond with pressure data.
M/S Polled I/O Connection
The M/S Polled I/O Connection establishes a data exchange between Master
and Slave devices whereby the Master device sends an I/O message with 0
or more data to a Slave device, and the Slave device must respond with 0 or
more data bytes.
Polling
A request/response method of exchanging data.
Safe State (Safe Mode)
A operational mode or state that is considered “safe” whereby the normal
controller process is shut down and mechanical and sensing mechanisms
are placed in a safe condition.
Service
A service is a pre-defined action that a Class provides. The most commonly
used services are used to configure the device such as Get Attribute (0x0E)
or Set Attribute (0x10). Other types of services may directly affect the
behavior of a Class (or Object) such as Reset (0x5), Stop (0x6), or Start
(0x7). There are many more services not listed here and each Class
specifies which Services it supports.