990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 43

• 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

Presentation
(continued)
Modicon
automation platform
Safety I/O modules
Module 140 SDO 953 00S is a discrete output module and its safety function is to
help ensure:
That the CPU control is actually applied to the output:
b
b
In contrast, as soon as the internal diagnostics reveal that a part of the system has
become inoperative, the module is designed to help ensure the channel switches
safely to the fallback position, i.e. to apply a “0” command, zero voltage.
Diagnostics
140 SDI 953 00S, see page 1/32.
Like safety modules and CPUs, the 140 SDO 953 00S module is internally fully
redundant. The output is controlled by two different control devices. Each is
controlled by a microprocessor. See diagram page 1/34.
The output stage is checked. Schematically, each output consists of two switches in
series. The mid-point voltage
to each microprocessor. As there is only one situation where at point
can be floating point, both switches open, the mechanism checks with certainty the
possibility of opening both switches, to create the safety function. Thus:
When the current PLC command is “0”, the module checks from time to time whether
it is capable of controlling both switches in possible combinations, except for a
command at “1”.
When the current PLC command is “1”, combinations are tested. The output
changes to 0 briefly, for < 1 ms. This has no effect in industrial control where the
controlled devices are motors or valves that are insensitive to disturbances in control
lasting this long.
The diagram (page 1/34) also shows the connection of the external 24 V power
supply designed to help ensure detection of any failure of the supply (details, see
page 1/34).
Diagnostics of the safety discrete output module
140 SDO 953 00S (continued)
Safety function
Internal diagnostics
Whether communication between the module and the CPU is regular and correct.
Whether the internal diagnostics confirm that the module is correctly integrated.
2
to
5
®
are identical to those of the discrete input module
Quantum
6
is assessed, and this data item is sent separately
™
6
the voltage
1/35
10
10
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9