Siemens SIMATIC S7-300 Hardware And Installation Manual page 6

Contents
Figures
1-1 Documentation S7-300 .....................................................................................1-2
1-2 Additional Documentation .................................................................................1-3
1-3 SIMATIC Technical Support..............................................................................1-4
3-1 Installing an S7 system .....................................................................................3-1
4-1 Modules in an S7-300 .......................................................................................4-1
5-1 Horizontal and vertical installation.....................................................................5-3
5-2 Shielding terminal module.................................................................................5-5
5-3 Clearance ..........................................................................................................5-6
5-4 Rack with eight signal modules.........................................................................5-8
5-5 Full assembly using racks ...............................................................................5-11
5-6 Power loss dissipated .....................................................................................5-15
5-7 S7-300 configuration with grounded reference potential
(CPU 313 - 318-2 DP) ....................................................................................5-18
5-8 CPU with grounded reference potential (as supplied) ....................................5-19
5-9 S7-300 configuration with floating reference potential
(CPU 313 - 318-2 DP) ....................................................................................5-21
5-10 Creating a floating reference potential on a CPU ...........................................5-22
5-11 Configuration with isolated modules ...............................................................5-24
5-12 Configuration with non-isolated modules ........................................................5-25
5-13 Grounding concept for the S7-300 with CPU 31xC ........................................5-29
5-14 Grounding concept for the S7-300 (excluding CPU 31xC) .............................5-30
5-15 Example: S7-300 with load power supply unit from PS 307 ...........................5-33
5-16 Example of an MPI subnet ..............................................................................5-47
5-17 Example: Maximum distances in the MPI subnet ...........................................5-48
5-18 Example of a PROFIBUS subnet ....................................................................5-49
5-19 Example: CPU 314C-2 DP as MPI and PROFIBUS nodes ............................5-50
5-20 Example of PG access across network boundaries (routing) .........................5-51
5-21 Installing the terminating resistors in an MPI subnet ......................................5-52
6-1 Holes for mounting the 2 m rail .........................................................................6-4
6-2 Free space required for an S7-300 installation .................................................6-6
6-3 Inserting slot numbers in modules ..................................................................6-10
7-1 connecting the protective conductor to the rail .................................................7-4
7-2 Setting the mains voltage selector switch for the PS 307 .................................7-5
7-3 Wiring the power supply module and the CPU .................................................7-7
7-4 Move the front connector into wiring position....................................................7-9
7-5 Slide the labelled strips into the front panel ....................................................7-12
7-6 Shielding contact element underneath two signal modules ............................7-14
7-7 Connecting 2-wire cables to the shielding contact element............................7-15
7-8 Bus connector: Enabled and disabled terminating resistor.............................7-17
8-1 S7-300 slots and the associated module start addresses ................................8-2
8-2 Addresses of the I/O of digital modules ............................................................8-5
8-3 I/O Addresses of a digital module in Slot 4 .......................................................8-6
8-4 I/O addresses of an analog module in Slot 4 ....................................................8-7
9-1 Insert a back-up battery into CPUs 313/314 .....................................................9-7
9-2 Insert the memory card into the CPU................................................................9-8
9-3 Insert the micro memory card into the CPU......................................................9-9
9-4 Connecting a PG to an S7-300 .......................................................................9-10
9-5 Connecting a PG to multiple S7-300 PLCs.....................................................9-11
9-6 Connecting a PG to a subnet ..........................................................................9-12
9-7 PG connected to an ungrounded S7-300 .......................................................9-13
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S7-300 Programmable Controller Hardware and Installation
A5E00105492-02