Rockwell Automation AutoMax ControlNet Communication Interface Module - Manual (Page 14)

Page 14 AutoMax ControlNet Module
Publication number DSMBCN-UM001B-EN-P February 2003
OK LED
The MBCN contains a hardware watchdog that monitors operation of the
MBCN hardware and software. The hardware watchdog times out only
when there is a catastrophic hardware or firmware failure on the MBCN.
The green OK LED is on when the hardware watchdog is OK and is off
if the watchdog times out.
NOTE: The hardware watchdog is NOT the same as the host watchdog.
See page 72 for information on using the host watchdog.
MAC ID Thumbwheels
Use the two thumbwheels labelled MAC ID to set the MBCN’s address
on ControlNet. The upper thumbwheel sets the most significant digit;
the lower thumbwheel sets the least significant digit.
To maximize network efficiency and reduce network overhead, you
usually assign ControlNet addresses consecutively, starting at 1.
NOTE: 0 is not a valid address.
The MBCN reads the thumbwheels only at power-up. You must power
down and power back up for changes in the thumbwheel settings to be
recognized.
The thumbwheel switches must be positioned in the center of the detent.
You can verify the switch settings by displaying register 32.
Serial Configuration Port
The serial CONFIG port on the front of the MBCN can be used to:
• update the firmware on the MBCN
• update the FPGA (field programmable gate array) configuration on
the MBCN
Note: you normally update both using ControlFlash over ControlNet.
The serial cable for a standard PC COM port must have lines 2 and 3
swapped. It does not require any handshaking. Pins 2 and 3 are wired
the same as a PC 9-pin COM port. A cable is provided with the MBCN
when shipped in the original packaging.
1
2
3
4
5 1
2
3
4
5
6
7
8
9 6
7
8
9
Figure 1 Serial Cable Wiring
Connect to the serial port using any communication software. For
example, you can use the HyperTerminal program supplied with
Windows. The MBCN serial port supports a baud rate of 57.6 Kbaud,
with no parity, 8 data bits and 1 stop bit.
Refer to page 73 for information on updating MBCN firmware.