Contents
S7-300 Programmable Controller Hardware and Installation
vi A5E00105492-01
Figures
1-3 SIMATIC Customer Support Hotline.................................................................1-4
2-1 Installing a SIMATIC S7 system........................................................................2-4
3-1 S7-300 modules ................................................................................................3-2
3-2 Horizontal and vertical installation of an S7-300...............................................3-3
4-1 Horizontal and vertical installation.....................................................................4-3
4-2 Shielding terminal module.................................................................................4-5
4-3 Clearance..........................................................................................................4-6
4-4 Module rack with eight signal modules .............................................................4-8
4-5 Full assembly ..................................................................................................4-10
4-6 Power loss dissipated .....................................................................................4-13
4-7 S7-300 configuration with grounded reference potential ................................4-16
4-8 S7-300 configuration with floating reference potential....................................4-17
4-9 Configuration with isolated modules ...............................................................4-19
4-10 Configuration with non-isolated modules........................................................4-20
4-11 Grounding conception S7-300 with CPU 31xC...............................................4-24
4-12 Grounding conception S7-300 ( not with CPU 31xC) .....................................4-25
4-13 Example: S7-300 with load power supply from PS 307..................................4-27
4-14 Example of an MPI subnet..............................................................................4-40
4-15 Example: Maximum distances in the MPI subnet ...........................................4-41
4-16 Example of a PROFIBUS Subnet ...................................................................4-42
4-17 Example: CPU 314C-2 DP as MPI and PROFIBUS node..............................4-43
4-18 Example of PG access across network boundaries (routing).........................4-44
4-19 Activation of the terminating resistors in an MPI subnet.................................4-45
5-1 Holes for mounting the 2-m profile rail..............................................................5-4
5-2 Free space required for an S7-300 installation.................................................5-6
5-3 Inserting slot numbers in modules ..................................................................5-10
6-1 Bonding the protective conductor to the profile rail...........................................6-4
6-2 Setting the mains voltage selector switch for the PS 307.................................6-5
6-3 Wiring the power supply module and the CPU .................................................6-7
6-4 Move the front connector into wiring position....................................................6-9
6-5 Slide the labelled strips into the front panel ....................................................6-12
6-6 Shielding contact element underneath two signal modules............................6-14
6-7 Connecting 2-wire cables to the shielding contact element............................6-15
6-8 Bus connector: Enabled and disabled terminating resistor.............................6-17
7-1 S7-300 slots and the corresponding module start addresses...........................7-2
7-2 Addresses of the I/O of digital modules ............................................................7-4
7-3 I/O Addresses of a digital module in Slot 4.......................................................7-5
7-4 I/O addresses of an analog module in Slot 4....................................................7-6
8-1 Insert a backup battery into CPUs 313/314 ......................................................8-6
8-2 Inserting the Memory Card in the CPU31x .......................................................8-7
8-3 Inserting the Memory Card in the CPU31xC.....................................................8-8
8-4 Connecting the PG to an S7-300 ......................................................................8-9
8-5 Connecting a PG to multiple S7-300 PLCs.....................................................8-10
8-6 Connecting a PG to a subnet..........................................................................8-11
8-7 PG connected to an ungrounded S7-300 .......................................................8-12
8-8 Sequence of operation for resetting CPU memory with the mode
selector switch.................................................................................................8-15
8-9 Sequence of operation for cold start with the mode selector switch
(CPU 318-2DP only) .......................................................................................8-17
8-10 Intermediate memory in CPU 31x-2 DP/31xC-2 DP as DP Slave..................8-31
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