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S5-115U Manual
4.2.2
Transferring the Program
There are two ways of entering the control program in the CPU:
•
Transfer the program to a memory submodule
and insert the submodule into the receptacle of the CPU. CPUs 941 and 942 process the control
program direct from the submodule. CPUs 943 and 944 copy the contents of the memory
submodule into the internal program memory at cold restart so that it can then be processed
at extremely high speed. In this way, a PLC or a system can be started up without the need for
a programmer.
•
Transfer the program direct into the internal program memory of the CPU.
Transferring the Program to a Memory Submodule
To program a memory submodule you require a programmer with the S5-DOS "EPROM/EEPROM"
package.
You must take account of the following when transferring your STEP 5 control program to a
memory submodule for plugging into the submdodule receptacle of the CPU:
•
Use only EPROM/EEPROM submodules; RAM submodules are only suitable for CPUs 941/942
as an expansion to the internal program memory.
•
Note the following special features of the CPUs when using memory submodules 375-1LA61
and 375-1LA71:
- EPROM 375-1LA61 (64 Kbytes) for CPU 943 and for CPU 944:
Only 48 Kbytes of the 64-Kbyte memory capacity can be used in both CPU 943 and 944.
When programming these memory submodules, note that the absolute address BFFD must
not be exceeded!
- EPROM 375-1LA71 (128 Kbytes) for CPU 944:
An EPROM 375-1LA71, that can only be used in the CPU 944, must only be programmed to
the absolute (word) address BFFD.
The reason:
The capacity of the internal program memory of the CPU 944 is limited to 96 Kbytes.
Insert the memory submodule in the submodule receptacle of your programmer and program
it with the S5-DOS "EPROM/EEPROM" PACKAGE. The programmer manual contains a
detailed description of this package.
After programming the memory submodule, insert it in the submodule receptacle of the CPU
while the PLC is switched off.
Switch on the power supply of the CPU.
Overall Reset
Special features of the CPU 943/CPU 944:
After Overall Reset, the STEP 5 control program is loaded automatically from the memory
submodule into the internal program memory of the CPU in the case of the CPU 943 and CPU 944.
If you do not perform Overall Reset after POWER ON, i.e. if the internal program memory still
contains valid blocks, the following will happen:
•
Blocks that have been loaded from E(E)PROM have the ID "Block in EPROM" in internal
program memory. After POWER ON, these blocks are deleted so that they can then be loaded
again.
•
Blocks that do not have the ID "Block in EPROM", remain in internal program memory after
POWER ON.
•
Before the blocks are transferred from the memory submodule into internal program
memory, the CPU deletes invalid blocks in internal program memory (Compress function)!
EWA 4NEB 811 6130-02b
PLC System Start-Up and Program Test
4-3
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