CTI Products MCN RCD System Planner - Manual (Page 50)

Appendix E System Limitations when using HIB and IIB Modules Together
Page 46 MCN Comparator Display System Planner
9. Appendix E System Limitations when using HIB
and IIB Modules Together
Because the console VOTE and DISABLE lines are bi-directional, the console’s LEDs will be lit if the
console’s outputs are active. Because of this, the console could still indicate a DISABLE or VOTE on
a receiver even if there is a problem in the network cabling or the Comparator I/O Module. Take for
example the system shown in Figure 4.
When the DISABLE button on the console is pressed, the DISABLE LED on the console will
immediately turn on and stay on after the DISABLE button is released since it is a latched output. The
console will show a Disable condition, even if there was a problem with the network or the AIB.
Likewise, in a mixed system with HIBs and IIBs, if a receiver is disabled through the console (with its
latching output) and then a PC user re-enables the receiver, the receiver will actually be enabled, but
the console will show it as disabled. In this case, the console operator must press the disable button
again to release the latch in the console.