Meggitt VM600 Hardware Manual

VM600 MPS hardware manual (standard version) MAMPS-HW/E 4 - 1
Edition 17 - February 2018
Different versions of the MPC4 card
MPC4 / IOC4T CARD PAIR
4 MPC4 / IOC4T CARD PAIR
4.1 Different versions of the MPC4 card
The MPC4 machinery protection card is available in different versions, including a standard
version, a separate circuits version and a safety (SIL) version.
NOTE: Both the standard and the safety (SIL) versions of the MPC4 card are certified to
IEC 61508 and ISO 13849. The MPC4SIL version was developed to permit a wider
range of installation options.
The original IEC 61508 and ISO 13849 certification process targeted a VM600 rack for
safety-related system (SRS) applications with a limited range of cards, that is, standard
MPC4 / IOC4T card pairs and RLC16 relay cards (see 4.1.1 Standard version of the MPC4).
Then Meggitt Sensing Systems decided to safety certify another system with additional
functionality, such as monitoring. To safety certify such a VM600 rack, it was necessary to
ensure that there is no possibility of the configuration being inadvertently modified. The safety
version of the MPC4 card (MPC4SIL) overcomes this potential configuration issue by not
implementing a VME bus interface, so data corruption via the VM600 rack backplane’s VME
bus is impossible.
4.1.1 Standard version of the MPC4
The standard MPC4 card is the original version, intended for systems using a VM600 rack
with a limited range of cards, that is, standard MPC4 / IOC4T card pairs and RLC16 relay
cards.
The standard MPC4 has a VME-compatible slave interface and is software configurable via
RS-232 (on the panel of the MPC4 card) or via VME for a networked VM600 rack. It also
supports all processing modes (see Table 7-1).
4.1.2 Separate circuits version of the MPC4
The separate circuits version of the MPC4 card is intended for systems using a separate
circuits version of the VM600 rack. The separate circuits MPC4 was developed in accordance
with the CEI/IEC 60255-5 standard: “Insulation coordination for measuring relays and
protection equipment – Requirements and tests” and has slightly different circuitry
(see 9.10 Grounding options).
Like the standard MPC4, the separate circuits MPC4 has a VME-compatible slave interface
and is software configurable via RS-232 (on the panel of the MPC4 card) or via VME for a
networked VM600 rack. It also supports all processing modes (see Table 7-1).
4.1.3 Safety version of the MPC4
The safety (SIL) version of the MPC4 card, that is the MPC4SIL, was developed to permit a
wider range of installation options with a single VM600 rack, for example, condition
monitoring in addition to machinery protection. To safety certify these systems, it was
necessary to ensure that the safety MPC4 is isolated from the other cards in a VM600 rack,
so that there is no possibility of its configuration being inadvertently modified.
As the safety MPC4 (MPC4SIL) does not have a VME bus interface, corruption of its
configuration is impossible as it is only software configurable via RS-232 (on the panel of the
MPC4 card). Therefore, it is now possible to define a single VM600 rack configuration
containing condition monitoring cards (such as the CMC16 and XMx16) and relay cards (such

Meggitt VM600 Specifications

General

Brand	Meggitt
Model	VM600
Category	Measuring Instruments
Language	English