Siemens S5-135U/155U appendix Startup, Validity Check

Central Controllers and Expansion Units Power Supply Units

Startup and	The following flowchart provides an overview of the sequence for startup
Validity Check	and validity check of a CC with CPU inserted and with no user program. For
	the CPU 948, all steps relating to the memory submodule are skipped.

Insert memory submodule in

CPU (not with the CPU 948)

CPU at ªSTOPº

Connect power supply unit

Switch on supply voltage

	PS:		PS:
	LED ªDC5Vº			No
		No	Correctly wired?
	and ªDC 24Vº on, all
			Voltage Present?
	others off						Replace bty
	Yes						compartment
			Yes	Yes
	CPU:		LED ªRB	No
No	LED ªBASPº on			Press	Replace
				RESET
	LED ªSTOPº flashing fast		Lowº on		rechargeable
				LED off
	all others off				battery	Yes
				Yes
				No			No
	Yes		LED ªMB	Press	Check backup bty	Fault
				RESET
			Lowº on		and replace	corrected
				LED off
					if necessary
	CPU general reset						Yes
			LED ªFan
					Check
			Faultº on
					Fan		Fault	No
								Replace PS
							corrected
			LED		Check load
			ªVoltage		voltage
					connection
			Lowº on
	CPU:		CPU:	No	Replace CPU
	LED ªSTOPº on	No	LED ºBASPº on
						or
	LED ªBASPº on		LED ªSTOPº flashing fast
					repeat startup
	all others off		all others
			off
	Yes		Yes
			Memory	No
	Reset CPU: Set to ªReset,º		submodule:
				Insert memory
	switch from ªSTOPº to ªRUNº		correctly inserted?	submodule	correctly
			Yes
	CPU:		Replace memory submodule
	LED ªRUNº on,	No
	LED ªBASPº off
	Yes
	Unit O.K.

Figure 4-5 Startup

System Manual	4-11
C79000-G8576-C199-06