Spectrum Controls 2085-IF4XOF4-SC, Руководство пользователя

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3-30 Chapter 3: Configuring the 2085-IF4XOF4-SC Using CCW
User’s Manual Pub. 0300307-01 Rev. A
• When the module is powering up for running voltage measurement with
the open circuit detection option enabled, the open circuit condition will
be checked first, and every 3 seconds thereafter, using the 470 Hz filter.
It will take an additional 15 ms to perform the detection.
Product Safety
3.9.1 Watchdog
There are multiple watchdogs at work in the module. Any one of them can cause
a fault condition and disable outputs. A power reset is required to clear the
condition if possible.
Controller Watchdog
After a power cycle, and the controller is initialized, it has a 30 ms command
timeout interval. When the timeout expires, the controller enters the idle state and
waits for up to 130 ms. If no valid communication is received, the controller
communication watchdog will fire. Once the watchdog is executed, the controller
no longer communicates with the module MCU and holds its reset line.
Hardware Watchdog
The module also uses a hardware watchdog IC that will reset the module MCU if
it does not assert it within at least 900 ms. The backplane reset line is also tied to
the Hardware Watchdog. The MCU is required to distinguish between a reset
caused by a watchdog timeout vs. a normal bus reset to avoid a false positive.
3.9.2
Glitch Requirements
The module is required to predictably control outputs under various conditions.
The Micro850 or Micro870 controller has two operation modes, Program and
Run, that can be controlled via a physical switch or the CCW software. The
following table describes these conditions and expected behavior:
Condition/Transition Expected Behavior of Outputs
Controller and
Module Power-up
No Channel outputs and inputs until valid configuration is
downloaded to the controller.
To Run Mode
Once the controller receives valid configuration and switches from
Program Mode to Run Mode,
• Output channels can output current or voltage based on the
value user entered in the Output Ch<x> (AO_03:00).
• Input channels start to scan.
To Program Mode
All outputs are OFF and all inputs are running but stop reporting
input data to the controller.
3.9.3 Peripheral Device Communications
During normal operation, the module MCU communicates with:
• One four-channel DAC and four individually addressed Output Drivers.
• Multiplexed of PGA and ADC for input measurement.