CPU Specifications
and Operation
4–8
CPU Specifications and Operation
Many CPU setup tasks involve the use of Auxiliary (AUX) Functions. The AUX
Functions perform many different operations, ranging from clearing ladder memory,
displaying the scan time, copying programs to EEPROM in the handheld
programmer, etc. They are divided into categories that affect different system
parameters. Appendix A provides a description of the AUX functions.
You can access the AUX Functions from DirectSOFT
or from the D2–HPP
Handheld Programmer. The manuals for those products provide step-by-step
procedures for accessing the AUX Functions. Some of these AUX Functions are
designed specifically for the Handheld Programmer setup, so they will not be
needed (or available) with the DirectSOFT package. The following table shows a list
of the Auxiliary functions for the Handheld Programmer.
AUX 2* — RLL Operations 5B HSIO Configuration
21 Check Program
5D Scan Control Setup
22 Change Reference AUX 6* — Handheld Programmer
Configuration
23 Clear Ladder Range 61 Show Revision Numbers
24 Clear All Ladders 62 Beeper On / Off
AUX 3* — V-Memory Operations 65 Run Self Diagnostics
31 Clear V Memory AUX 7* — EEPROM Operations
AUX 4* — I/O Configuration 71 Copy CPU memory to HPP EEPROM
41 Show I/O Configuration 72 Write HPP EEPROM to CPU
AUX 5* — CPU Configuration 73 Compare CPU to HPP EEPROM
51 Modify Program Name 74 Blank Check (HPP EEPROM)
53 Display Scan Time 75 Erase HPP EEPROM
54 Initialize Scratchpad 76 Show EEPROM Type (CPU and
HPP)
55 Set Watchdog Timer AUX 8* — Password Operations
56 Set Communication Port 2 81 Modify Password
57 Set Retentive Ranges 82 Unlock CPU
58 Test Operations 83 Lock CPU
59 Override Setup
Before you enter a new program, be sure to always clear ladder memory. You can
use AUX Function 24 to clear the complete program.
You can also use other AUX functions to clear other memory areas.
S AUX 23 — Clear Ladder Range
S AUX 24 — Clear all Ladders
S AUX 31 — Clear V Memory
The DL05 Micro PLC maintain 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 in system memory.
AUX 54 resets the system memory to the default values.
Auxiliary Functions
Clearing an
Existing Program
Initializing System
Memory
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