Yokogawa EJX115A - Manual (Page 39)

<6. Explanation of Basic Items>
6-6
IM 01C25T04-01EN
6.4 AI Function Block
The AI function block is a unit of the software.
During execution, it incorporates data from the
SENSOR transducer block. After execution, it
updates analog outputs and processes newly
generated alarms. AI function blocks can provide
a discrete output which shows the status of LO,
LO_LO, HI, or HI_HI. In terms of function, there is
no difference between the three AI function blocks
provided in DPharp.
6.4.1 Function Blocks
The AI function block, via the Channel, incorporates
analog signals from the transducer block, performs
scaling processing, filtering, signal linearization,
fail safe control and alarm processing before
outputting. It has the function to generate a discrete
output. Figure 6.3 presents the AI function block.
Simulate
PV from TB
Scaling
PV_SCALE
Simulate.Enable
Linearization
LIN_TYPE
Scaling
OUT_SCALE
Filter
PV_FTIME
Limit Check
HI, HI_HI
LO, LO_LO
Fail
Safe
Value, Status
AUTO
MAN
OUT
OS
OUT
OUT
MODE_BLK. Actual
Value, Status
Value, Status
F0605.ai
Figure 6.3 Diagram of the AI Functional Block