Siemens Simatic S7-400 - Manual (Page 94)

Power Supply Modules
3-14
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Table 3-8 INTF, DC5V, DC24V LEDs, continued
LED
INTF Remedy Cause of Fault DC24V DC5V
H D* D Short circuit or overload on 5 V and
24 V Check load on the power supply
module.
Possibly remove modules
H D* H/D ** Short circuit or overload on 5 V Check load on the power supply
module. Possibly remove modules
H H D
If the standby switch is at the
position, illegal external supply on 5 V Remove all modules.
Determine which module is faulty
If the standby switch is at the I
position, short-circuit or overload on
24 V
Check load on the power supply
module.
Possibly remove modules
D B H Voltage restored after short circuit or
overload on 5 V if faults occur in
operation Press FMR momentary-contact
pushbutton:
Flashing light changes to constant light
Dynamic overload on 5 V Check load on the power supply
module.
Possibly remove modules
D H B Voltage restored after short-circuit or
overload on 24 V if faults occur in
operation Press FMR momentary-contact
pushbutton:
Flashing light changes to constant light
Dynamic overload on 24 V Check load on the power supply
module.
Possibly remove modules
D B B Voltage restored after short circuit or
overload on 5 V and 24 V if faults occur
in operation Press FMR momentary-contact
pushbutton:
Flashing light changes to constant light
D B B Dynamic overload on 5 V and 24 V Check load on the power supply
module.
Possibly remove modules
D = LED is dark; L = LED lights up; F = LED flashing;
* If the power supply module does not start up again after a few seconds once the
overload has been removed, remove power to the module for 5 minutes and then
switch it on again. If the module stills does not start up, you must replace it. This
applies to 6ES7407-0KA01-0AA0, release 3 and for 6ES7407-0KR00-0AA0,
release
≤ 5.
** Depending on the short-circuit resistance
If either the 5 VDC or 24 VDC LEDs remains dark after switching on, the system
has not powered up.
If either of the 5 VDC or 24 VDC LEDs of the PS 407 10AR remains dark for longer
than 1 or 2 seconds after it is switched on, the power supply module will not start
up.