Rockwell Automation 57C329 Remote I/O Communications, AutoMax - Manual (Page 20)

2Ć6
The Remote I/O Head can control up to 4 digital rails, analog I/O rails,
or Local Heads. Each Local Head can in turn control up to 4
AutoMate digital rails. Therefore, a Remote I/O Head with 4 Local
Heads connected to it can control a maximum of 16 digital rails. The
digital rails must be all inputs or all outputs.
The AutoMax Remote I/O Head consists of a power supply, two
printed circuit boards (a processor board and a remote I/O
communications board), a faceplate, and a protective metal
enclosure. See figure 2.3 for an illustration of the Remote I/O Head.
The 25Ćpin DĆshell connector on the faceplate supports the
RSĆ232Ćcompatible serial port described in section 5.0. The BNC
connector on the faceplate is used to connect the Remote Head to
the Remote I/O network. The four I/O connectors are used for Rail
and/or Local Head communications.
The thumbwheel switch on the faceplate is used to set the Remote
I/O network drop number. Drop numbers 1 through 7 inclusive
indicate valid Remote I/O drop numbers.
The terminal strip on the faceplate provides connections for incoming
power as well as a set of normally open contacts from the Ready
Relay. The contacts are closed when the Remote I/O Head is
operating properly and open if a problem is detected in the onĆboard
microprocessor. These contacts can be used to take remedial action
in the event of a problem with the onĆboard microprocessor.
For diagnostic purposes, the faceplate contains a sevenĆsegment
LED that displays error codes (see Appendix D). The faceplate also
contains six status LEDs, which are labeled as follows:
RUN (amber): Normally on; if off, indicates that the CPU watchdog
has timed out.
POWER (green): When on, indicates power is being supplied to the
CPU and internal voltages are within range.
CPU READY (amber): Will turn on after the powerĆup diagnostics
have been completed successfully and the CPU watchdog has
not timed out. Also indicates the state of the Ready Relay
contacts. When on, the Ready Relay contacts are closed.
FAULT MSB / FAULT LSB (amber): Normally off. When on, these
LEDs indicate the particular rail that has experienced a fault.
These LEDs are valid while the Rail Fault LED is lit. See section
6.8 for more information.
RAIL FAULT (red): When on, indicates that a rail fault has occurred.
Note that during powerĆup diagnostics, the bottom four LEDs (CPU
READY, FAULT MSB, FAULT LSB, and RAIL FAULT) will stay on long
enough to allow verification that they will light.