Micromod MOD: 1800P - MOD 30ML Identity Module (Version 2) System, I/O and Communications Functions - Manual (Page 213)

Logic Functions - Book 1
ANALOG INPUT BLOCKS (VCI, TII, TI, RI, RTI, RTTI)
7-3
7.2 ANALOG INPUT BLOCKS (VCI, TTI, TI, RI, RTI RTTI)
The analog input blocks (VCI, TTI, TI, RI, RTI and RTTI) provide an input link from a physical
analog input module (VCIM, TIM, RIM, WRIM, RAIM) to a loop. The relationship between
these blocks is discussed in Sections 5 and 6. Functions performed by these blocks include
input filtering, action, normalization, linearization, and scaling. The types of analog input block
are:
•
VCI Voltage Input Block
•
TTI Temperature Transmitter Input Block
•
TI Thermocouple Input Block
•
RI Resistance Input Block
•
RTI RTD Input Block
•
RTTI RTD Transmitter Input Block
An input block is a loop function block that provides a logical input link to an input module (one
physical input point). As many input blocks as required can be connected to a module block
source. The input value is buffered in the task state table for the loop. Process input and
output routines use these tables to pass data between the module blocks and the process
algorithm blocks which run at the scan group interval configured for the task. The local
modules described in Section 5.4, Analog Input Module Blocks VCIM, TIM, RIM, WRIM are
updated every 150 milliseconds.
An input block uses the Input Module pointer specified during configuration to set the
connection between the block and the module. This connection is fixed by configuration and
can not be changed through the database.
This section describes the analog input block types and the relationship of their configuration
parameters to the block’s function. All parameters for these blocks are described in one listing
since many of the parameters are the same.