Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
2-3
Racks
OVERVIEW OF VM600 MPS HARDWARE
2.1.1.1 Slot number coding for cards in the rear of a VM600 system rack
Most cards installed in the rear of a VM600 system rack (ABE04x) use an electronic keying
mechanism to help ensure that the card is installed in the correct slot (for example, in the slot
directly behind the associated processing card in the front of the rack). This includes IOC4T,
IOC8T and IRC4 cards.
For VM600 system racks (ABE04x), the rack’s slot numbers are fixed (hard-wired) for each
rack slot (module (card) position) and cannot be changed. Each slot of the backplane has a
unique, hard-wired 4-digit binary code (see Figure 2-2) as follows:
Slot 3 Code 0011
Slot 4 Code 0100
Slot 5 Code 0101
Slot 6 Code 0110
Slot 7 Code 0111
Slot 8 Code 1000
Slot 9 Code 1001
Slot 10 Code 1010
Slot 11 Code 1011
Slot 12 Code 1100
Slot 13 Code 1101
Slot 14 Code 1110.
Accordingly, VM600 system rack slot number coding requires that a card’s slot number is set
to match the rack slot where it is installed. As a result, a VM600 card can only be used in a
VM600 system rack slot for which it has been configured.
For example, a MPC4 / IOC4T card pair configured for slot 03 (VM600 MPSx software) must
be installed in slot 03 of a system rack (ABE04x). In order to be used in a different rack slot,
the card’s rack slot must be reconfigured using the VM600 MPSx software.
Cards that implement this electronic keying mechanism have a bank of micro-switches that
can be used to assign a slot number to the card (see Figure 2-2). This code is stored in the
slot number (address) assignation register on the card (IOC4T, IOC8T or IRC4).
Each card compares its slot number with the hard-wired slot number coded on the system
rack’s backplane (see Figure 2-3). The result of the comparison is typically displayed on the
SLOT ERROR LED on the cards panel:
• If the codes are identical, the LED is green.
• If the codes are not identical, the LED is red.
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