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Using a Quantum IEC Hot Standby System
130
840 USE 106 00 January 2003
Nontransfer Area of State RAM
Nontransfer Area The nontransfer area contains the Hot Standby status register, which is used to
monitor the states of both controllers. You may include other 4x registers in the
nontransfer area to reduce scan time.
The Start: field is used to specify the first 4x register in the nontransfer area. The
Length: field is used to define the number of contiguous registers in the nontransfer
block. If you choose to define a nontransfer area, the range of legal values for this
entry field is 4... n, where n is the number of configured 4x registers. However, when
defining the nontransfer area, the command register (first entry of the Hot Standby
dialog) must be outside the nontransfer area.