990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 207

• 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
interrupts
(continued)
,
Modicon
automation platform
High-speed input module with interrupts
When an input on the 140 HLI 340 00 module has not been configured as an
interrupt or a latch, it can operate as a normal high-speed input (this is the default
operating mode for inputs on the module).
The high-speed input data is taken into account by the normal I/O handling process and is
updated at the end of a program segment. These inputs are often considered auxiliary
process inputs to interrupt operations that require a combination of interrupts, latches and
high-speed inputs. Response times for high-speed inputs are 30 μs from off to on and
130 μs from on to off.
Another form of interrupt processing available as standard on Quantum can be
accomplished by using the CPU's internal clock to generate interrupt signals at
regular intervals (this method does not require the use of the 140 HLI 340 00
module). The interrupt timing is user-programmable.
These interrupts can be used when the application program needs to take account of
data events at predictable or regular intervals and this process lasts less than the
CPU's scan time. Timer interrupts can be programmed down to 1 ms minimum,
corresponding to the CPU clock speed (see below for the impact of interrupts on
the scan time).
The Quantum CPU handles both timer interrupts and interrupts generated by the
140 HLI 340 00 module in the same manner, by executing the interrupt handler in the
subroutine segment of the 984 ladder logic application. The logic in the interrupt
handler determines what steps need to occur to handle the interrupt. The IMIO
(immediate I/O) instruction can be used to force input reading or output writing in
the interrupt handler. IMIO instructions can read or write real-world I/O data on the
local rack.
For example, if an interrupt has been generated and the interrupt handler needs to
acquire the current value in a high-speed counter module, the IMIO instruction can be
activated to read the position asynchronously to the scan. This information could then
be used by the interrupt handler to make a logical decision based on the current value.
At the end of the interrupt handler routine, the information can be used to update an
output module on the local rack.
A 984LL program is broken down into sections called segments. Real-world inputs
are read just prior to segments being resolved, and real-world outputs are written just
after segments are resolved. This happens in a parallel process where the I/O are
updated during program execution. Within a Quantum CPU, there can be up to
32 segments of ladder logic that define the limits of the program for logic solving
during normal I/O updating.
Functions (continued)
High-speed input mode
Interrupts
Time-based interrupts
984LL interrupt instructions (built into the firmware of Quantum CPUs)
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