Micromod MOD: 1800P - MOD 30ML Identity Module (Version 2) System, I/O and Communications Functions - Manual (Page 167)

Logic Functions - Book 1
ANALOG OUTPUT MODULE BLOCK (AOM)
5-47
5.5 ANALOG OUTPUT MODULE BLOCK (AOM)
The analog output module block serves as the data handling block for the current output
module. This block is used to output an analog value to, and receive a readback value from
the current output module. The current output module converts a digital count value to a 4-
20mA field signal and converts it back to counts for readback in 100 milliseconds. The
module’s output value is checked against the previous value and becomes a raw input value.
Analog outputs are processed through an on-board select circuit which passes the data
between the blocks and the modules using a three phased 150 millisecond scan cycle for the
board (all modules are read every 150 milliseconds). The analog output module block
determines output scaling, tracking and failure conditions.
Available to the user as block outputs are the result, scaled result, readback, and track status
and the data quality for each as well as the active and unacknowledged status of the block’s
diagnostic errors. A functional block diagram of a analog output block is shown in Figure 5-26
(part 1) and Figure 5-27 (part 2). The menus used to configure the Analog Output Module
block are shown in Figure 5-28 through 5-30.
Bad
Lock
Initialize
Bad
Unlock
See PART 2
Manual
TRACK
Auto
Normal
Lock
Manual
Auto
BAD
GOOD
Input
LSP
FP Value
AND
OR Track
Status
I/O Lock
(from IF Block)
Initialize
PART 1
TRUE
(init flag)
Bad Inputs
Accepted
(YES/NO)
Quality Check
LSP Data Quality
GOOD
Mode
Manual
Auto
RQ
GOOD
Sheet 1 of 2
Instrument State
(from IF Block)
Not Run
Figure 5-26. Analog Output Module Block, Functional Block Diagram (Part 1)