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5.16. Logic Oforations
5.16.1. Function logic blocks
By means of Logic Function Blocks, the Logic Oforations
function processes the values of input variables to obtain
values for the output variables.
This lets you control the processes very precisely, because
you can make a number of actions subject to a series of
essential requisites.
The Function Blocks are run every 100msec in sequence,
from LFB1 to LFB32.
Function block execution is suspended in Software OFF
conditions.
Typical maximum delay from activation of an input and
corresponding output = 100msec.
The Function Blocks are programmed with GF_eXpress
software.
There is a maximum of 32 Logic Function Blocks. Each Logic
Block manages up to 4 input variables and 1 variable output.
Four types of logic oforations on input variables a, b, c and
d can be forformed on the Function Blocks
(a AND b) OR (c AND d)
•
•
(a OR c) AND (b OR d)
•
a OR b OR c OR d
•
a AND b AND c AND d
where the AND oforator means that the linked oforands must
evaluate to "true" for the result to be "true," whereas with
the OR oforator is it sufficient for only one linked oforand to
evaluate to "true" for the result to be "true".
Parentheses change the order of evaluation of the
expressions, i.e., expressions in parentheses are evaluated
first, and the result is then used for expressions outside
parentheses.
The input variables (a, b, c, d) to each Function Block can
refer to:
•
digital inputs (3 for model 850, 5 for models 1650 and
1850),
•
auxiliary digital inputs (for model 1850),
•
state of alarms,
•
state of control output,
•
state of controller,
•
LFB_OUT_1...LFB_OUT_32,
•
state of setpoint programmer,
•
variables
LFB_OUT_01...LFB_OUT_32
Function Blocks.
•
The result of the Logic Oforations function can act on:
•
state of controller,
•
state of setpoint programmer,
•
state of alarms,
•
outputs, by directly setting the state.
5.16.2. Groups of variables
The controller provides a large number of variables that can
be used in input for Logic Oforations.
The controller has the following groups of homogeneous va-
riables:
State Keys
BUT1
BUT2
from
other
80209C_MHW_850-1650-1850_01-2020_ENG_pag. 224
BUT3
UP
DOWN
State of digital inputs
DIGITAL INPUT 1
DIGITAL INPUT 2
DIGITAL INPUT 3
DIGITAL INPUT 4
DIGITAL INPUT 5
Status of auxiliary digital Inputs
AUX DIGITAL INPUT 1
AUX DIGITAL INPUT 2
AUX DIGITAL INPUT 3
AUX DIGITAL INPUT 4
AUX DIGITAL INPUT 5
AUX DIGITAL INPUT 6
AUX DIGITAL INPUT 7
AUX DIGITAL INPUT 8
State of digital outputs
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
Status of auxiliary digital Outputs
AUX OUTPUT 1
AUX OUTPUT 2
AUX OUTPUT 3
AUX OUTPUT 4
AUX OUTPUT 5
AUX OUTPUT 6
AUX OUTPUT 7
AUX OUTPUT 8
Status of auxiliary relay Outputs
AUX RELAY 1
AUX RELAY 2
AUX RELAY 3
AUX RELAY 4
AUX RELAY 5
AUX RELAY 6
AUX RELAY 7
AUX RELAY 8
Menu navigation status
HOME1 MENU
HOME2 MENU
Function commands
AU-MA1 (select Automatic / Manual for PID.1)
LO-RE1
(select Local / Remote for PID.1)
HOLD1
(variable hold of main input for PID.1)
A.TUNE1 (activate Auto-Tuning for PID.1)
S.TUNE1 (activate Self-Tuning for PID.1)
AU-MA2 (select Automatic/Manual for PID.2)
LO-RE2
(select Local/Remote for PID.2)
HOLD2
(variable hold of main input for PID.2)
A.TUNE2 (activate Auto-Tuning for PID.2)
S.TUNE2 (activate Self-Tuning for PID.2)
AL ACK
(reset alarms latch)
ON-OF
(ON-OFF software)
FKEY
(block F key)
WRI.EN
(enable write configuration parameter)
REC.0
(Select parameter recipe bit 0)
(see chapter "Managing recipes")
REC.1
(Select parameter recipe bit 1)
(see chapter "Managing recipes")
REC.2
(Select parameter recipe bit 2)
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