Quantum High Speed Module
The 140 HLI 340 00 is the Quantum high speed, latch, and interrupt input module. Each of the module’ s 16 independently configured 24 Vdc inputs can be used with sink or source field devices. Primarily designed for use in time critical I/O applications, the module is currently supported for use only in local backplane configurations. This restriction applies regardless of the intended operating mode and point configuration of the module. When used in conjunction with I/O events (interrupt handling), inputs can be updated asynchronously to the normal I/O scanning mechanism. Inputs are updated once per scan for normal logic solve processing.
The following sections include descriptions, along with features and restrictions of the operating modes.
NOTE: It's not recommended to use this module with an input frequency higger than 2.5 Khz (risk of loss of event)
The default configuration of the 140 HLI 340 00 module is high-speed mode.
Features
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This mode is the default configuration of the module
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Response times as fast as 30 μs turn on and 130 μs turn off
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Normal I/O service routine is utilized
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Compatibility with two or three wire input devices
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Used with sink or source field devices
Latched High Speed Input Mode
In this mode, the module is read by the controller at the end of the scan, similar to other input modules in the Quantum product line. This function captures very high speed signals which is read by the controller. It does not, however, require the processor to be interrupted.
Features
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Latching of high speed signals with pulse widths greater than 30 μs turn on and 130 μs turn off
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Automatic unlatching of the point after the controller has read the point
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Can be configured to latch by the input turning on or off
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Compatibility with two or three wire input devices
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Used with sink or source field devices
Restrictions
The interrupt function is only available over local I/O. The interrupt module provides a physical interrupt to the controllers, which are serviced by the Control Expert event processing.
Features
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The interrupt can be configured to trigger by the input turning on, off, or both
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Input No. 1 has a higher input priority than input No. 16 for point priority
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Slot position No. 1 has a higher priority than slot position No. 16 for module priority
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Compatibility with two or three wire input devices
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Used with sink or source field devices
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Interrupt inputs look like high speed inputs at I/O time
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The interrupt is immediately read, acknowledged by the controller, and then cleared automatically
Restrictions
All inputs of the module can be configured independently, so any mixture of High Speed Inputs, Latched Inputs and Interrupt Inputs is possible.
NOTE: If the module is configured in a split mode, where there are interrupts and latched inputs, note that the latched input data is read and cleared at the interrupt service time and may not be valid at the end of the scan.
