138 Communication protocol
Instance attributes
The Allocation Information attribute consists of the following:
• Allocation Choice Byte (BYTE)
The Allocation Choice byte indicates which of the Predefined
Master/Slave Connections are active (in the Configuring, or
Established state).
The Allocation Choice byte is initialized to 00 at device power-
up or reset.
• Master’s MAC ID (UINT8)
The range of values is 0…63 and 255 decimal. A value in the
range of 0…63 indicates that the Predefined Master/Slave
Connection Set is currently allocated and denotes the MAC ID
of the device that performed the allocation. The value 255
means that the Predefined Master/Slave Connection set has
not been allocated. The Master’s MAC ID attribute is initialized
to 255 (FF hex) at device power-up/reset.
Connection object, class 05h
Note: Do not modify this object. This object is only used while
establishing the connection between the adapter module and the
PLC.
The connection class allocates and manages the internal
resources associated with both I/O and explicit messaging
connections. The specific instance generated by the connection
class is referred to as connection instance or connection object.
# Attribute
name
Instance attributes
(Instance #1)
Description Data
type
1 MAC ID Get, Set Node address UINT8
2 Baud Rate Get, Set Baud rate of the device UINT8
5 Allocation
information
Get, Set Allocation Choice
Master’s MAC ID
Struct:
BYTE
UINT8
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