RELIANCE 45C110 Ladder control card

If the MVME172LX tries to access offboard resources in a nonexistent location and is not system controller, and if the system does not have a global bus timeout, the MVME172LX waits forever for the VMEbus cycle to complete. This will cause the system to lock up. There is only one situation in which the system might lack this global bus timeout: when the MVME172LX is not the system controller and there is no global bus timeout elsewhere in the system. Multiple MVME172LXs may be installed in a single VME chassis. In general, hardware multiprocessor features are supported. Note If you are installing multiple MVME172LXs in an MVME945 chassis, do not install an MVME172LX in slot 12. The height of the IP modules may cause clearance difficulties in that slot position.

Other MPUs on the VMEbus can interrupt

 disable, communicate with, and determine the operational status of the processor(s). One register of the GCSR (global control/status register) set includes four bits that function as location monitors to allow one MVME172LX processor to broadcast a signal to any other MVME172LX processors. All eight registers are accessible from any local processor as well as from the VMEbus.

The following circuits are protected 

by solid-state fuses that open during overload conditions and reset themselves once the overload is removed: 

❏ LAN AUI 

❏ SCSI terminator 

❏ Remote reset connector 

❏ IndustryPack 5V 

❏ ±12V The FUSES LED illuminates to indicate that all fuses are functioning correctly. If a fuse opens, power must be removed for several minutes to allow the fuse to return to a closed or shorted condition.

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