Table of Contents
Advertisement
7.3 MX18 SYSTEM CONTROLLER AUTO CHANGEOVER UNIT, CONTINUED
ALARM 1. The MX18 CPU is operating correctly, to detect CPU fail.
This alarm is ACTIVATED 10 seconds after any RESET command, or 10 seconds
following cold-boot initialization.
ALARM 2. Master Computer Fail.
An alarm ACTIVE is generated when communications is lost with the MASTER
Computer. The alarm will CLEAR upon restoration of communications with the MASTER
computer.
ALARM 3. Standby Power Supply Lost.
An alarm ACTIVE is generated when the + 9VDC standby power supply falls below
approximately 6V. The alarm will CLEAR upon restoration of the standby power supply.
ALARM 4. Main Power Supply Lost.
An alarm ACTIVE is generated when the + 9VDC main power supply falls below
approximately 6V. The alarm will clear upon restoration of the main power supply.
ALARM 5. Slave Computer Fail.
An alarm ACTIVE is generated when communications is lost with the SLAVE Computer.
The alarm will CLEAR upon restoration of communications with the SLAVE computer.
ALARM 6. Master Selected Status.
An alarm ACTIVE is generated when the MASTER Computer is selected as the system
controller. The alarm will CLEAR if the SLAVE Computer is selected as the system
controller. This alarm is activated by Automatic & Manual selection changeover.
Rev. C
CAUTION: To avoid the MX18 indicating failure during
system startup, be sure to set the 'All' parameter in the
CTRL field of the Serial Communications Ports, for any
ports that are connected to a MX18.
The MX18 is designed to report various status information
regarding its operation. It simulates a RD400 alarm input
module located in pseudo-slot (0). In order for these
alarms to be generated, they must first be enabled. This
is done automatically by the MAX-1000 when the required
alarm status pseudo inputs are defined in the External
Alarm Input Table.
CAUTION: Alarm inversion is NOT supported. All alarms
must be defined as "N/O" type alarms. With the exception
of ALARM (1), all other alarms are enabled only for the
MX18 using the base ID code (i.e. H70).
7.3-2
HMXMU001018
10/06
Advertisement
Table of Contents
