Writing To A Flash Card In The H System - Siemens SIMATIC S7-400H Manual

Writing to a FLASH Card in the H System

You can write to a FLASH card in an H system in the RUN mode without having to
stop the H system. To do this the online data of the hardware configuration and the
user program in the CPUs have to match the corresponding offline data in the
engineering station.
Proceed as follows:
1. Set the standby CPU to STOP and insert the FLASH card in the CPU.
2. Perform a memory reset for the CPU using STEP 7.
3. Download the hardware configuration with STEP 7.
4. Download the program data using the STEP 7 command "Download User
Program to Memory Card". Attention: Be sure to select the correct CPU in the
selection dialog.
5. Switch to the CPU with the changed configuration using the "Operating Mode"
dialog. The master-standby switch-over is performed; the CPU with the Flash
card is no the master CPU. The standby CPU is now in STOP.
6. Now insert the Flash card into the CPU in the STOP mode. Perform a memory
reset for the CPU using STEP 7.
7. Carry out step 4: Download the program data using the STEP 7 command
"Download User Program to Memory Card". Attention: Be sure to select the
correct CPU in the selection dialog.
8. Perform a warm restart of the standby CPU using the "Operating Mode" dialog.
The system now goes to the "Redundant" system mode.
The online and offline data consistency described above also applies when you
remove FLASH Cards from an H- system. In addition, the available RAM cannot
be less than actual size of the STEP 7 program (STEP7 Program > Block
Container > Properties "Blocks").
1. Set the standby CPU to STOP and remove the FLASH card. Check the RAM
configuration if necessary.
2. Perform a memory reset for the CPU using STEP 7.
3. Download the block container using STEP 7.
4. Switch to the CPU with the changed configuration using the "Operating Mode"
dialog.
5. Remove the FLASH card from the CPU now in the STOP state. Check the
RAM configuration if necessary and perform a memory reset for the CPU.
6. Perform a warm restart of the standby CPU using the "Operating Mode" dialog.
The system now goes to the "Redundant" system mode.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Modifying the System During Operation
11-51