Siemens S7-400 Checks Prior to Switching On for the First Time, Mounting and Wiring Modules

Commissioning

6.2Checks Prior to Switching On for the First Time

Checks Prior to Switching On for the First Time

After installing and wiring your S7-400, it is advisable to check the steps carried out so far, before switching on for the first time.

Table 6-1 contains a guide in the form of a checklist for your S7-400, and refers to the chapters containing additional information on the subject.

Table 6-1 Checklist to be Used Before Switching On for the First Time

Points to be Checked	See	See Reference	See Reference
	Installation	Manual	Manual “CPU
	Manual	“Module	Data” Chapter
	Chapter	Specification”
		Chapter
Racks
Are the racks secured on the wall, in	2
the frame or cabinet?
Have the necessary clearances been	2
allowed?
Are cable ducts or fan subassemblies	2
correctly installed?
Is the ventilation in order?	2
Grounding and Chassis Ground Concept
Is there a low-impedance connection	2
(large surface, large-area contact) to
the chassis ground?
On all racks, is the connection bet-	4
ween reference ground and chassis
ground correct (metallic connection or
ungrounded operation?)
Are all grounds of the non-isolated	2
ded modules and the grounds of the
load current power supplies connec-
ted to the reference points?
Mounting and Wiring Modules
Are all modules correctly inserted and	2
screwed on?
Are all front connectors correctly wi-	4
red, plugged into the right modules,
and screwed on?
Are any necessary cable ducts or fan	2
subassemblies fitted correctly?

Automation System S7-400	Hardware and Installation	6-3
A5E00850741-01