Rockwell Automation 57C329 Remote I/O Communications, AutoMax - Manual (Page 24)

2Ć10
2.2.4 Remote I/O Head (M/N 57C330)
The Remote I/O Head has an onĆboard power supply that provides
all voltages necessary to power the Remote I/O Head and the I/O
system. The power supply has an input voltage of 120/240 VAC.
The Remote I/O Head contains a microprocessor that connects to the
four I/O ports via the I/O interface circuitry. It connects to the Remote
I/O network through one channel of a serial I/O device. The second
channel of the serial I/O device provides a monitor port for the user. A
block diagram is shown in Appendix B.
The Remote I/O Head contains a watchdog timer that is enabled
when power is turned on to the Head. The microprocessor must reset
the watchdog timer within a specified time or the microprocessor will
shut down and the RUN and CPU READY LEDs on the faceplate will
turn off.
A set of normally open contacts from the Ready Relay are provided
on the terminal strip. The contacts open whenever a problem is
detected in the onĆboard microprocessor. These contacts should be
used in an EĆstop (emergency stop) circuit to remove power from the
outputs in case of emergency. See section 3.5.5 for more information.
At power up, the onĆboard microprocessor will run diagnostics on the
microprocessor, EPROM, RAM, serial I/O, and the I/O interface, as
well as perform systemĆlevel diagnostics. As each test is run, a
number is written out to the sevenĆsegment display. If there is a fault
during the diagnostics, the microprocessor will halt, the watchdog will
time out, and the sevenĆsegment display will show the code of the
failed diagnostic.
2.2.5 Remote Drive Interface Head (M/N 57C329)
The Remote Drive Interface Head has an onĆboard power supply that
provides all voltages necessary to power the Remote Drive Interface
Head and to communicate with up to four drives. The power supply
has an input voltage of 120/240 VAC.
The Remote Drive Interface Head contains a microprocessor that
connects to the four I/O ports via the I/O interface circuitry. It
connects to the Remote I/O network through one channel of a serial
I/O device. The second channel of the serial I/O device provides a
monitor port for the user. A block diagram is shown in Appendix B.
The Remote Drive Interface Head contains a watchdog timer that is
enabled when power is turned on to the Head. The microprocessor
must reset the watchdog timer within a specified time or the
microprocessor will shut down and the RUN and CPU READY LEDs
on the faceplate will turn off.
A set of normally open contacts from the Ready Relay are provided
on the terminal strip. The contacts open whenever a problem is
detected in the onĆboard microprocessor. These contacts should be
used in an EĆstop (emergency stop) circuit to remove power from the
outputs in case of emergency. See section 3.5.5 for more information.
At power up, the onĆboard microprocessor will run diagnostics on the
microprocessor, EPROM, RAM, serial I/O, and the I/O Interface, as
well as perform systemĆlevel diagnostics. As each test is run, a
number is written out to the sevenĆsegment display. If there is a fault
during the diagnostics, the microprocessor will halt, the watchdog will
time out, and the sevenĆsegment display will show the code of the
failed diagnostic.