Micromod MOD: 1800P - MOD 30ML Identity Module (Version 2) System, I/O and Communications Functions - Manual (Page 27)

Logic Functions - Book 1
SYSTEM BLOCKS
3-1
3
SYSTEM DATABASE PARAMETERS
3.1
SYSTEM BLOCKS
System blocks contain the overall instrument related information and functionality that does
not logically fall within any loop or function block. These blocks exist through the System
resource for instrument and loop Libraries. Only one interface and system event block is
supported as part of the instrument configuration. These blocks are automatically made
available with each instrument. Other system resources at the instrument level are the loop
compound, the configured list and Modbus list blocks.
IF
Interface Block. Reference
Section 3.3
. The Interface Block is used to
specify up to five independent function block groupings for a database.
Loops are included in a group by specifying the desired group number in
each loop block. The group scan intervals set the rate at which each
group will be executed when the instrument is in the RUN state.
SE System Event Block. Reference Section 3.4 . This block stores a
configurable number of time stamped event codes for the diagnostic
points and events reported by the database blocks. These codes are
translated into messages for operator display or logging.
LP CPD Loop Compound. The loop compound block is a list connected compound
that contains a Loop Block. Any function block placed in this compound
becomes part of the loop block scan group. To guarantee proper
execution, loop blocks must be assigned the same scan group number on
the interface block. Reference
Section 3.5
for information on the loop
block. As a compound, this resource can be saved and loaded for use
elsewhere. Loop library resources are available within this compound.
CL Configured List. Reference Section 3.6 . This block is used to define
database attributes to be collected as a foreground list for a ICN or MSC
module block, or as a Modbus list for a MSC module block or solely to
specify data to be included in interface files (TIF or MIF).
ML Modbus List. Reference Section 3.7 . A Modbus List is used to specify
instrument data that is to be converted into pure Modbus data (a 2-byte
positive value). It is connected through a MSC block.
Algorithm (function) blocks (those blocks that execute the logic) cannot operate independently
in the instrument database. Groups of related function blocks must be organized into loops. To
create a loop, a loop compound is used.