990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 288

• Manufacturer Part Number: 990XCP98000
• Description: QUANTUM CPU BATTERY FOR S
• Manufacturer: SQUARE D

Specifications of 990XCP98000

• Rohs Compliant: YES
• Battery Capacity: 1800mAh
• Battery Technology: Lithium
• Battery Voltage: 3V
• Battery Terminals: Connector
• Weight: 0.12lb

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Application services
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Global data structure
Processor 1 Global data
Processor 2 Global data
Processor 3 Global data
Processor 1 application
Processor 1 Data
Processor 1
Modicon
automation platform
Modbus Plus
The global database allows global variables to be shared across a Modbus Plus
network of PLCs. Because the global database is broadcast, this global information
is updated extremely quickly.
Each CPU has up to 32 global data registers; Modbus Plus nodes can support 2048
global data registers (32 registers x 64 CPUs). Each of up to 64 CPUs on the
network is responsible for updating its own 32 global data registers using an MSTR
instruction. Each CPU also has the ability to read the 32 global data registers of the
other CPUs on the network. When a CPU updates its global data, this information is
automatically broadcast to the other CPUs on the network. Each receiving CPU
collects the new global data and stores them in its network interface memory. A CPU
wishing to access another node's global data actually extracts them from its own
network interface.
The global database works only within the same segment of the Modbus Plus
network. It cannot be transmitted through an NW BMB5 C00p bridge multiplexer or
an NW BP85 002 bridge.
Peer Cop is a software utility accessible under Unity Pro
and Concept and can be used to define point-to-point data transactions between a
CPU and the other nodes on the Modbus Plus network. Peer Cop uses defined
references (bits or registers) as source and destination. A block of registers can
therefore constitute the data source on the sending node, and another block of
registers can be the destination on the receiving device. A maximum of 32 words can
be addressed on a CPU via Peer Cop (a 16-channel “discrete” module is equivalent
to one word).
Peer Cop offers two methods of data transaction - global and specific. Because
Modbus Plus nodes monitor the network, any one of them can extract the data
addressed specifically to it. Nodes can also extract global data. Peer Cop enables
the Modbus Plus node currently holding the token to direct specific data to particular
nodes and broadcast global data to all the nodes that are part of its token frame.
Each sending node can specify particular references as data sources, and each
receiving node can specify the same or different references as data targets. When
nodes receive global data, each node can index to specific locations in the incoming
data and extract specific lengths of data from those points. Data transactions can
therefore take place quickly as part of the token rotation and can be set up between
sending references and receiving references.
Network and data security are obtained with the CPU's write-protect feature. It is
therefore possible to configure sections of references within the CPU as read-only
so that those references cannot be written by a node on the network.
Peer Cop, like the global database, works only within a segment of the Modbus Plus
network.
Global database
Peer Cop
Automatic update by broadcasting
Processor 1 Global data
Processor 3 Global data
Processor 2 Global data
Modbus Plus network
Processor 2 application
®
Processor 2 Data
™
Processor 2
Quantum
network
™
™
, Concept
Processor 1 Global data
Processor 2 Global data
Processor 3 Global data
Processor 3 application
Processor 3 Data
Processor 3
™
or ProWORX
™
0