990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 93

• 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

Functions
Modicon
automation platform
Hot Standby system
Unity Pro
b
The memory space reserved for the application program is managed by the Hot Standby
system with Unity Pro
the 140 CPU 671 60 CPU, dedicated to Hot Standby applications, can be increased to
7.168 Mb by the addition of a PCMCIA format memory card, see page 2/13.
b
Installation of the application program does not differ fundamentally from installing a
single PLC program. It essentially uses the information provided by a dedicated
dialog box, filled in during the configuration of the system.
b
The 140 CPU 671 60 CPU is a double-slot module, with a mini-terminal at the top of
the front panel. Equipped with an LCD screen and navigation buttons, it has a
special sub-menu for the standby system. It can be used for example to check the
status of the PLC, or to force the PLC to active or inactive standby state.
b
Control of the standby system is managed by an internal register called the
Command Register, carried by a system word. This Command Register accepts
user requests, expressed via the configuration dialog box and/or via the mini-
terminal on the front panel. This Command Register can be used in particular to
disable acknowledgement of commands made from the mini-terminal.
Feedback on the status of the standby system is given by a Status Register that is
also carried by a system word.
b
Standard function blocks are provided in the Unity Pro programming environment,
making it possible to read/write to the Command Register and read the Status
Register, by individually identifying each of the bits carrying a particular function.
b
At the start of each scan cycle, the content of the current register in the “Primary”
PLC is transferred to the “Standby” PLC via the fiber optic link, at the same time as
the content of the I/O state tables are transferred to it. The Hot Standby system is
thus able to transfer the 128 kb made available to receive the located variables
(RAM State) from the “Primary” PLC to the “Standby” PLC. As far as unlocated
application variables are concerned, and also application data such as DFB instance
data, for example, up to 512 Kb can be transferred.
Functions
Application program memory space
Configuration
Mini-terminal on front panel
System registers
Function blocks
Cyclic transfer of the application context
Hot Standby
Application
“Primary” PLC
Inputs
program
Outputs
™
software
(coprocessor)
™
®
. With an embedded 1024 Kb RAM memory, the RAM memory for
Data
Quantum
Fiber optic link
30 ms for
5 ms for
100 Kb
100 Kb
™
(coprocessor)
Data
“Standby” PLC
program (1st
section only)
Hot Standby
Application
Inputs
Outputs
3/17
10
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1
1
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2
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