AutomationDirect DL105, Руководство пользователя

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Appendix
A
Auxiliary
Functions
A--5
Auxilliary Functions
DL105 PLC User Manual, 3rd Edition
AUX 5* — CPU Configuration
The following auxiliary AUX functions allow you to setup, view, or change the CPU
configuration.
DL105 PLCs can use a program name for the CPU program or a program stored on
EEPROM in the Handheld Programmer. (Note, you cannot have multiple programs
stored on the EEPROM.) The program name can be up to eight characters in length
and can use any of the available characters (A--Z, 0--9). AUX 51 allows you to enter a
program name. You can also perform this operation from within Direct SOFT by
using the PLC/Setup sub-menu. Once you’ve entered a program name, you can
only clear the name by using AUX 54 to reset the system memory. Make sure you
understand the possible effects of AUX 54 before you use it!
AUX 53 displays the current, minimum, and maximum scan times. The minimum
and maximum times are the ones that have occurred since the last Program Mode to
Run Mode transition. You can also perform this operation from within Direct SOFT
by using the PLC/Diagnostics sub-menu.
The CPU maintains system parameters in a memory area often referred to as the
“scratchpad”. In some cases, you may make changes to the system setup that will be
stored in system memory. For example, if you specify a range of Control Relays
(CRs) as retentive, these changes are stored.
NOTE: You may never have to use this feature unless you have made changes that
affect system memory. Usually, you’ll only need to initialize the system memory if you
are changing programs and the old program required a special system setup. You
can usually change from program to program without ever initializing system
memory.
AUX 54 resets the system memory to the default values. You can also perform this
operation from within Direct SOFT by using the PLC/Setup sub-menu.
DL105 PLCs have a “watchdog” timer that is used to monitor the scan time. The
default value set from the factory is 200 ms. If the scan time exceeds the watchdog
time limit, the CPU automatically leaves RUN mode and enters PGM mode. The
Handheld displays the following message E003 S/W TIMEOUT when the scan
overrun occurs.
Use AUX 55 to increase or decrease the watchdog timer value. You can also perform
this operation from within Direct SOFT by using the PLC/Setup sub-menu.
DL105 CPUs provide certain ranges of retentive memory by default. Some of the
retentive memory locations are backed up by a super-capacitor, and others are in
non-volatile EEPROM. The EEPROM memory locations are V4000 to 4177, and
V7630 to V7647. The default ranges are suitable for many applications, but you can
change them if your application requires additional retentive ranges or no retentive
ranges at all (see Appendix E).
AUX 51
Modify Program
Name
AUX 53
Display Scan Time
AUX 54
Initialize
Scratchpad
AUX 55
Set Watchdog
Timer
AUX 57
Set Retentive
Ranges