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Configuring Hardware and Communication Connections STEP 7.pdf

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2 <strong>Configuring</strong> Central Racks<br />

2.1 Rules for Arranging Modules (SIMATIC 300)<br />

Basic Rule<br />

Slot Rules (S7-300)<br />

Modules must be inserted in the rack without gaps.<br />

Exception: For installations with one rack, one slot in the configuration table must<br />

remain free (reserved for the interface module). With the S7-300, this is slot 3 <strong>and</strong><br />

with M7-300, the slot after the module group (slot 3, 4, 5, or 6). In the actual<br />

configuration there is no gap because the backplane bus would be interrupted.<br />

Rack 0:<br />

• Slot 1: Power supply only (for example, 6ES7 307-...) or empty<br />

• Slot 2: CPU only (for example, 6ES7 314-...)<br />

• Slot 3: Interface module (for example, 6ES7 360-.../361-...) or empty<br />

• Slots 4 through 11: Signal or function modules, communications processors, or<br />

free.<br />

Racks 1 to 3:<br />

• Slot 1: Power supply module only (for example, 6ES7 307-...) or empty<br />

• Slot 2: Free<br />

• Slot 3: Interface module<br />

• Slots 4 through 11: Signal or function modules, communications processors<br />

(dependent on the inserted interface module), or free.<br />

<strong>Configuring</strong> <strong>Hardware</strong> <strong>and</strong> <strong>Communication</strong> <strong>Connections</strong> with <strong>STEP</strong> 7<br />

A5E00706939-01 2-1

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