3 UCN Status Displays
3.8 IOP Detail Status Displays
280 HPM High-Performance Process Manager Service R688
Honeywell December 2020
LLAI IOP Detail Status display definitions
The LLAI IOP Detail Status display information and the REQUEST OTD STATUS and LINE
FREQUENCY targets are defined in the following table.
Table 55 Low Level Analog Input IOP Detail Status Display
The ac line period in microseconds
The Reference Junction raw count
The Reference Junction temperature in degrees centigrade
When selected, the REQUEST OTD STATUS target, displays
the current state of the IOP’s Open Thermocouple Detection
(OTD) option. If the target is selected, it is replaced with two
targets showing the possible OTD states, ON or OFF, with the
current state shown in reverse video. If the IOP is in the Idle
state, and the Universal Station (US) keyswitch is in the
ENGineer position, the state may be changed by selecting the
desired target. Any other IOP state or any other keyswitch
position will result in an error message.
The LINE FREQUENCY target permits selection of 50 Hz or
60 Hz operation. The selection is identified by reverse video.
AO IOP Detail Status Display
There are two types of Analog Output IOPs and each type accommodates only certain FTA models.
Generally, the main difference in the types of AO IOPs is the number of FTA channels that the IOP
supports, either 8 or 16 channels. The “High Density” 16-channel IOP display is identified by the term
AO_16 in the first line at the top of the display and after ACTUAL TYPE in the third line of the
display. The 8-channel IOP display is identified by the term AO.
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