GE IC697MDL653 module
Technical data of product parameters
Anti-reset windup is a IC697MDL653feature that prevents the integral term from becoming
excessive when the output (CO) reaches a limit. When the sum of the PID and
bias terms in the output (CO) reaches the limit, the instruction stops
calculating the integral sum until the output (CO) comes back in range. The
integral sum is contained in words 17 and 18 of the control block.In the manual mode, the PID algorithm does not compute the value of the
control variable. Rather, it uses the value as an input to adjust the integral sum IC697MDL653
(words 17 and 18) so that a bumpless transfer takes place upon re-entering the
AUTO mode.
To set the manual output level, design your ladder program to write to the CV
address when in the manual mode. Note that this number is in the range of 0
to 16383, not 0 to 100. Writing to the CV percent (word 16) with your ladder
program has no effect in the manual mode but adversely effects bumpless
transfer. IC697MDL653
The example on the next page shows how you can manually control the
control variable (CV) output with your ladder program.ASCII port control instructions are queued in the order that they are
scanned and are dependent on one another to execute (except ACL
which executes immediately). For example, if you have an ARD (ASCII
Read instruction) and then an AWT (ASCII Write instruction), the
Done bit or the Error bit of the ARD must be set before the AWT can
begin executing (even if the AWT was enabled while the processor was
executing the ARD). A second ASCII port control instruction cannot
begin executing until the first has completed. However, the processor
does not wait for an ASCII port control instruction to complete before
continuing to execute your ladder program.This file type is valid for SLC 5/03 OS301 and higher, SLC 5/04, and SLC
5/05 processors. These are 42-word elements. You can address string lengths
by adding a .LEN to any string address (for example, ST17:1.LEN). Valid
string data file numbers are 9 to 255.
String lengths must be between 0 and 82 bytes. In general, lengths that are
outside of this range cause the processor to set the ASCII Error bit (S:5/15)
and the instruction is not executed.
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