Appendix A
Auxiliary Functions
A–5
Auxilliary Functions
AUX 5* — CPU Configuration
The following auxiliary AUX functions allow you to setup, view, or change the CPU
configuration.
DL05 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 DirectSOFT
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 DirectSOFT
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 DirectSOFT
by using the PLC/Setup sub-menu.
DL05 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 DirectSOFT by using the PLC/Setup sub-menu.
Since the DL05 CPU has an additional communication port, you can use the
Handheld to set the network address for port 2 and the port communication
parameters. The default settings are:
S Station address 1
S HEX mode
S Odd parity
You can use this port with either the Handheld Programmer, DirectSOFT, or, as a
communication port for DirectNET and MODBUS. Refer to DirectNET and
MODBUS manuals for additional information about communication settings
required for network operation.
AUX 51
Modify Program
Name
AUX 53
Display Scan Time
AUX 54
Initialize
Scratchpad
AUX 55
Set Watchdog
Timer
AUX 56
CPU Network
Address
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