DESCRIPTION AND OPERATION
FUNCTION CODES
WBPEEUI240759A0
2 - 3
ule. The interface operates independent of the microprocessor.
The microprocessor and I/O expander bus interface access
shared memory to transfer data.
Additionally, the EDI module incorporates a custom gate array
to perform the I/O expander bus interface function.
RS-232-C Interface
The EDI module uses a universal asynchronous receiver/
transmitter (UART) that is integrated into the ICC circuitry for
RS-232-C interface. The RS-232-C port is a nine-pin, D-type
connector (P5) located on the front panel and is mainly used for
firmware/protocol downloading.
Dipswitches
The EDI module contains six dipswitches for setting:
•
IP address (S1 through S4).
•
Hardware options (S5).
•
I/O expander bus address (S6).
LED Drivers
Front panel LEDs show:
•
Module state as either normal operation, halted, or off.
•
Normal and error codes.
MFT
The machine fault timer (MFT) is a security feature built into
the EDI module and most microprocessor based devices. The
timer is a one-shot timer that must be periodically reset by the
CPU to prevent it from timing out. If an error condition exists
that causes the EDI module to fail or operate incorrectly, the
timer will not be reset and will cause a time out condition. A
time out condition triggers a reset signal to halt the module
(i.e., module state LED lit red).
Stop/Reset
The stop/reset switch provides the ability to both halt the EDI
module and to restart the module after it halts.
FUNCTION CODES
The EDI module is configured using a set of five function
codes:
•
Factory Instrumentation Protocol Handler (FC 184).
•
Digital Input Subscriber (FC 185).
•
Analog Input Subscriber (FC 186).
•
Analog Output Subscriber (FC 187).
•
Digital Output Subscriber (FC 188).
These function codes reside in the MFP module as part of its
control configuration. Refer to
for function code con-
figuration information.
