M3452 vR8 EIP/PDP
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The Master/Slave Status bit (4.2.4.3.1.1) indicates the operation mode of
a module.
4.2.3.2.1. STATIC MASTER
Static Master systems have a single module that will always function
as the master. For systems that have a static Master module, set
the Master bit in the network interface (4.2.4.2.1.4).
4.2.3.2.2. DYNAMIC MASTER
For large systems that require more flexibility or redundancy, the
mode can be switched remotely. Modules selected as Slaves will
follow the signal on the Control Signal port from the single module
selected as a Master.
The dynamic master switching sequence should follow these steps:
Disable all modules by clearing the “Enable” input. Bus
regulation stops.
Set the Master Control flag (4.2.4.2.1.4) on the Master module.
Ensure that only one Master/Slave Bit is active in the system,
indicating that only one module is master.
Enable all modules. Bus regulation resumes.
4.2.4. FIELDBUS I/O
4.2.4.1. MEMORY MAP
The memory map shows the position of the control and status words in
relation to the base address on the network. Detailed descriptions of each
bit and register are in the next sections.
The memory map is word based, each word using 16 bits.
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