Emerson Process Management Bristol Series 9110 - Manual (Page 27)

CI-9110 3-3 Board Setup
3.3.1 Continuous Signal
A continuous input signal is one that, when placed in a TRUE state, will cause the output
to change until the input is set FALSE. To achieve this mode of operation, all five switches
of SW1 should be set to the OPEN position (bottom condition of Table 3-2). This will con-
figure the Regulator so that its output will change as long as the one signal applied to the
Raise and Lower Command Inputs is TRUE (dc = ON) and the other is FALSE (dc = OFF).
No other change will occur when both inputs are simultaneously set FALSE or TRUE.
Figure 3-1 - Option Switches on CPU Board
3.3.2 Incremental Signal
The five switches can be set for any increment from 0.110% per pulse to 1.830% per pulse.
The pulses that raise or lower the output perform in real time and are not stored. As a
requirement, each pulse must remain in a TRUE state for a period of time necessary for the
Remote Set Regulator to reach the new output value. Should the input change from a raise
to a lower operation (or vice-versa) before the completion of an incremental step, the un-
finished increment will be cut off and the next pulse will be freshly processed.
A unit that is set up with a slower rate of change value or a greater percent of full scale
change per input pulse will require a longer input pulse. Therefore, the minimum time
period required for an ON and OFF pulse to produce an output change is dependent upon
the settings of switches SW1 (1-5). There are no maximum limits for either the ON or OFF
pulse periods (time between pulses).