VMIVME-2210-100 VMIC 64通道瞬时继电器板

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VMIVME-2210-100 VMIC 64通道瞬时继电器板

The Abaco Systems / VMIC VMIVME-2210 provides 64 One Form C (SPDT) contacts to the user via two 96-pin DIN connectors. These relays are the magnetic latching type which means that, once a contact is set it will remain set (even if power is removed from the relay) until it is reset. All three contact points are brought out via the connector. They are the N.O. (Normally Open), N.C. (Normally Closed), and the Common contact points. The N.O. and the Common can be used to create One Form A contacts while the N.C. and common can be used as One Form B contacts. The N.O. contacts are on Row A of the connectors and the common contacts are on Row C of the connector as shown in Figure 1. This arrangement permits 64-conductor cables to be used for Form A switches.

The VMIVME-2210 is populated with double pole relays, but only one pole is brought out to the user. The other pole is used by the Built-in-Test (BIT) logic. The state of the controlling Data Registers or the N.C. poles is read during read accesses of the board. The Control Registers are located at the same address as the relays. This allows the user to monitor both the state of the user contacts and the Control Registers. Because the read pole and the user’s pole are controlled by the same coil, BIT can monitor the user’s contacts via the N.C. contacts of the second pole.

The N.C. contacts provide a logic one from the contacts for a logic one written to the Data Register. This provides positive data feedback from the contact BIT logic. When a logic one is written to the Control Register, it activates the relay which causes the N.O. contacts to close and the N.C. contacts to open. When the contact BIT logic is read, a logic one is returned.

The Control Data Registers are also monitored because the relays take a long time (7 ms maximum) to change their contacts. VMEbus accesses of the board can execute so quickly the relays seem to be faulty resulting in erroneous conclusions. To prevent this the user can check the Data Register’s state, instead of waiting for the relay’s contacts to close.

This board uses latching relays which hold their state when power is removed. This means that closed contacts stay closed until commanded to open.

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