DESCRIPTION AND OPERATION
FUNCTIONAL OPERATION
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I-E96-215A
®
address. The device address for the quick response controller
is set via an eight position dipswitch.
NOTE: The QRC cannot communicate over the controlway.
Memory
The on-board memory is 32 kilobytes of read only memory
(ROM), 4 kilobytes of random access memory (RAM) and 2 kilo-
bytes of nonvolatile random access memory (NVRAM).
The ROM contains the function code library. The RAM serves
two purposes: holds an operating copy of the configuration
while the module is in the execute mode of operation; provides
temporary storage for in-process algorithms. The NVRAM con-
tains the permanent copy of the module configuration. The
NVRAM of the quick response controller has the capacity for
approximately 199 function blocks.
Machine Fault Timer
The machine fault timer (MFT) is a resettable one-shot timer
that must be periodically set by the microprocessor. Several
conditions detected by the microprocessor will keep it from set-
ting the MFT. They are:
1. Trip block activated.
2. Excessive analog input gain/offset error.
3. Excessive analog output gain/offset error.
4. Power failure/reset during an NVRAM write.
If the MFT times out, the microprocessor halts. The QRC will
not respond over the module bus, and the status LED changes
to red. In addition, the digital outputs are de-energized and the
analog outputs will either hold their last value or go to the
power up preset value as selected during installation.
Digital Inputs/Outputs
There are three digital inputs and four digital outputs
on-board. The inputs are jumper-selectable to be energized by
24 VDC or 125 VDC. The inputs are optically-isolated; outputs
are isolated, open-collector type. The I/O signals are routed to
the NTCS02/04 termination unit through the NKTU01 cable or
to the NICS01 termination module through the NKTU02 or
NKTM01 cable.
