5/12/2017
TECH-538/D.W.O. 23160
Page 43 of 189
ICoT Function Blocks and I/O channels
As each block has its own tag
, throughout this document, all references to the FF blocks are made using
factory default tags. However, in a real application, block tags may be different from just “TRD” or “AI”.
Also, each Host system has its own naming conventions for block tags and how to expose them to user.
shows the pre-instantiated blocks, their addresses, called indexes (VFD object directory/table
index), and their descriptions available in the ICoT FF
Table 7:
Pre-instantiated blocks, default block tags, VFD indexes and descriptions
Default block tag
VFD
Index
Description
Resource Block
406
Resource Block
TRANSDUCER_WAPB2
480
Positioner Transducer Block
AI
617
Analog input for position or temperature measurement
PID
658
Proportional, Integral and Derivative control block
AO
727
Analog output to the pressure transducer
Before the ICoT can be configured it is important to understand which I/O channels and function blocks
are available. The following function blocks are pre-instantiated in the device:
•
Analog Input (AI)
: 1 (one) block available. The AI block can be used to read an ICoT input
measurement (in this case the actual measured valve position) and makes that data available to
other Fieldbus function blocks. A complete list of the AI parameters in found in the Section
•
Proportional, Integral and Derivative (PID)
: 1 (one) block available. PID block is used for process
control when Control in the Field (CIF) is used. It combines all of the necessary logic to perform
Proportional-Integral-Derivative (PID) control. The PID block may have a setpoint defined by
another function block when operating in cascade mode or directly set in the SP parameter,
when operating in Automatic mode. A complete list of the PID parameters is found in Section
•
Analog Output (AO)
: 1 (one) block available. AO block can be used to assign a Fieldbus output
value to the ICoT transducer. A complete list of the AO parameters is found in Section 11.4.5.
13
The uniqueness of the block tag can be guaranteed only by the host configuration system.
14
This information was checked in the ICoT version 4.2
