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Enhancements in Late Model CPUs

F-3

SIMATIC 545/555/575 System Manual

2. Since the CPU actually runs on compiled code stored in CL-memory,

the CPU will no longer declare a fatal error if an error in L-memory is

detected. Instead, the CPU will set a non-fatal error and keep running.

Status Word 1, bit 16 (STW1.16) indicates this condition and can only

be cleared by reloading the RLL application program from your PC (or

other programming device) to the PLC. The corrupted L-memory

cannot be displayed or edited online.

3. If there is an error in CL-memory, you will now be able to clear this

error from TISOFT or SoftShop with a restart Aux function (11 or 12)

rather than by having to reload the program, since all that is required

is a recompile of the RLL code that already exists in L-memory.

If an error occurs in CL-memory, you now have the additional option to set

DIP switch 10 (switch 8 on 575 CPUs) to allow the CPU to perform an

Auto Recompile during run-time. Before you use the Auto Recompile option,

you must determine if your process can accept a one-scan bump of a few

seconds for the recompile, which is equivalent to a recompile following a

run-time edit on the ladder program. In other words, if you can perform a

run-time edit to your program without disrupting your process, you should

be able to use this feature without a problem.

Switch 10 (switch 8 on 575 CPUs) is shipped in the Auto Recompile disabled

(left) position. To activate Auto Recompile, set the switch to the right

(enabled) position. Status Word 243 indicates the following information:

• Status Word 243 indicates that Auto Recompile is enabled by setting

bit 1 (STW243.1) to 1.

• The lower byte of Status Word 243 counts the number of times an Auto

Recompile has been accomplished since the last time the program was

compiled by the CPU.

After an Auto Recompile has been performed, at least eight good checksum

calculations must occur before another Auto Recompile is allowed. If eight

good checksum calculations are not accomplished, or if there is already an

L-memory checksum error logged (as described in item #2), then a fatal

error is declared and the “Program Memory Diagnostic Error” will be

displayed when the CPU is interrogated by TISOFT or SoftShop.

SoftShop Release 3.1 or greater and TISOFT Release 7.1 or greater provide

support for new error messages associated with these enhancements. It is

possible, however, to use older versions to read the new status words and

bits.

Using the

Auto Recompile

Function

Programming

Support

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