HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
8-14
Installation procedure for cards
INSTALLATION
8.4.2.1 CPUM cards running firmware version 066 or earlier
In a networked rack, how the CPUM running firmware version 066 or earlier reacts after it
detects a change of configuration for a card is always the same, as the CPUM is always the
configuration master:
• When this version of the CPUM detects a change of configuration for an MPC4 or AMC8
card, the CPUM will use the configuration for the card stored in the CPUM’s non-volatile
memory to reconfigure the card. That is, in the case of a configuration conflict, the
CPUM’s copy of the card’s configuration is the master.
8.4.2.2 CPUM cards running firmware version 067 or later
In a networked rack, how the CPUM running firmware version 067 or later reacts after it
detects a change of configuration for a card is determined by the setting of the CPUM’s
configuration master parameter, as shown in Figure 8-3.
The CPUM’s configuration master parameter selects one of two modes of operation:
• If VM600 cards (MPC4 and AMC8) are set as the configuration master, when the CPUM
detects a change of configuration for a card, the CPUM will read the configuration from
the card and save it in the CPUM’s non-volatile memory for future use. That is, in the
case of a configuration conflict, the card’s own copy of its configuration is the master.
• If the CPUM card is set as the configuration master, when the CPUM detects a change
of configuration for a card, the CPUM will use the configuration for the card stored in the
CPUM’s non-volatile memory to reconfigure the card. That is, in the case of a
configuration conflict, the CPUM’s copy of the card’s configuration is the master.
NOTE: By default, the configuration master parameter for CPUM cards running firmware
version 067 or later is set to VM600 cards (MPC4 and AMC8).
For example, in a networked VM600 rack with a CPUM card running firmware version 067,
the default behaviour is that VM600 cards are the configuration master. In such a rack, if an
MPC4 or AMC8 card’s configuration is changed using the RS-232 link on the panel of the
card or a card is replaced by another card of the same type with a different configuration
(keeping the same slot number), and the power supply to the rack is turned off and then
turned on, then the card’s configuration will remain the “new” configuration (see Figure 8-3).
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