Assembling the M7-400
8-45
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
Behavior of the CPU During Startup
During startup, the CPU compares the preset and actual configurations. You set
the duration of the test with STEP 7 in the “Startup” parameter block with the
“module time limits” parameter.
If the preset configuration = actual configuration, the CPU goes to RUN.
If the preset configuration
actual configuration, the reaction of the CPU depends
on the setting of the parameter for “Startup if preset configuration
actual
configuration”:
Starting if Preset
Actual
Config. = Yes (Default)
Starting if Preset
Actual Config. = No
CPU goes into RUN
CPU remains in STOP.
In this case, check whether all slaves are switched on or
display the content of the diagnostic buffer (see
Configuring Hardware and Communication Connections
with STEP 7 V 5.2).
To set the parameters in the “Startup” parameter block, see the M7-SYS User
Manual, the Configuring Hardware and Communication Connections with
STEP 7 V 5.2 manual, and the online help of STEP 7.
8.7.7
Checking the Status and Error Indicators
Switching On an M7-400 for the First Time
When the supply voltage is switched on, all status and error indicators of the CPU
of your M7-400 light up briefly. If the mode switch is set to STOP, the STOP
status/error indicator lights up after switching on. Otherwise the module boots up.
In the event of a fault, the INTF indicator lights up.
If this is not the case with your modules, please consult your Siemens contact at a
maintenance and repair center or call the SIMATIC hotline.
This completes preparations for operation as covered in this manual.
The remaining stages, such as installing the operating system and the user
program, can be found in the “M7-SYS” User Manual.
