6-32
Programming Your Application
590+ Series DC Digital Converter
DIGITAL INPUTS
Inverting the Input Signal
The default setting is for VALUE TRUE to be 0.01% and VALUE FALSE to be 0.00%.
Inverting the digital input is therefore simple; set VALUE TRUE to 0.00% and VALUE
FALSE to 0.01% (or any other non-zero number).
To do this:
1.
Set CONFIGURE I/O::CONFIGURE ENABLE to ENABLE
2.
Set DIGIN 1 (C6)::VALUE FOR TRUE to 0.00%
3.
Set VALUE FOR FALSE to 0.01%
4.
Reset CONFIGURE I/O::CONFIGURE ENABLE to DISABLE
Digital Input 1 now sends a 0 when the input signal is TRUE, and 1 when it is FALSE.
Using Digital Inputs with VALUE Parameters
Value parameters have values such as 100.00, or with units like 50.00%, 10.0 SECS etc.
You can use a Digital Input to send two fixed values to a VALUE parameter depending upon
the state of the input terminal, 24V or 0V. You set the two fixed values you require in the
VALUE TRUE and VALUE FALSE parameters.
For example, to connect Digital Input 1 to SPEED LOOP::SPD.PROP.GAIN :
1.
Set CONFIGURE I/O::CONFIGURE ENABLE to ENABLE
2.
Find the tag number for SPD.PROP.GAIN either from the function block detail in
this chapter, or from the Parameter Table: MMI Order - refer to Chapter 10. (It is 14).
3.
Set DIGIN 1 (C6)::DESTINATION TAG to 14
4.
Set VALUE FOR TRUE to 10.00%
5.
Set VALUE FOR FALSE to 30.00%
6.
Reset CONFIGURE I/O::CONFIGURE ENABLE to DISABLE
Digital Input 1 will now set SPD.PROP.GAIN to two values depending upon the state of the
input signal:
x
When the input terminal is at 24V, SPD.PROP.GAIN is set to 10.00
x
When the input terminal is at 0V, SPD.PROP.GAIN is set to 30.00
DIGITAL INPUT C4 and DIGITAL INPUT C5
You can configure digital input terminals C4 (Jog) and C5 (Enable) for your own use when
you do not need the external jog or current loop enable functions.
You can only configure the DESTINATION parameter for each of these blocks. Internally,
VALUE TRUE is fixed at 0.01% (+24V dc), and VALUE FALSE is fixed at 0.00% (0V).
This makes them suitable for switching LOGIC parameters only.
DIGITAL INPUT C4
Refer to the DIAGNOSTICS function block description, page 6-23.
To use terminal C4 as a spare digital input, remove the link between the output JOG
INPUT (C4) and the input JOG/SLACK in the AUX I/O function block, using
ConfigEd Lite. You can then tag the block's output JOG INPUT (C4) to a digital
parameter. Or, you may re-tag the parameter using the MMI.. The destination tag for
DIGITAL INPUT (C4) can be found in the SYSTEM::CONFIGURE I/O::DIGITAL
INPUTS menu in the MMI.
OUTPUT (DESTINATION TAG), Tag Number 494
Destination of DIGITAL INPUT C4
Range:
0 to 639
Default:
496 (AUX I/O::JOG/SLACK)
