Siemens CPU 312C Hardware And Installation Guide

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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1-1
Information Landscape of S7-300................................................................1-3
1-2 Additional Documentation ............................................................................1-4
1-3 SIMATIC Technical Support.........................................................................1-5
3-1 Installing an S7 system ................................................................................3-1
5-1 Modules in an S7-300 ..................................................................................4-1
4-1 Horizontal and vertical installation................................................................5-3
4-2 Shielding contact element ............................................................................5-5
4-3 Clearance .....................................................................................................5-6
4-4 Rack with eight signal modules....................................................................5-8
4-5 Full assembly using racks ..........................................................................5-10
4-6 Power loss dissipated.................................................................................5-15
4-7 CPU with grounded reference potential (as supplied) ...............................5-18
4-8 Creating an ungrounded reference potential on a CPU.............................5-19
4-9 Configuration with isolated modules ..........................................................5-21
4-10 Configuration with non-isolated modules ...................................................5-22
4-11 Grounding concept for the S7-300 with CPU 31xC ...................................5-26
4-12 Grounding concept for the S7-300 (excluding CPU 31xC) ........................5-27
4-13 Example: S7-300 with load power supply from PS 307.............................5-29
4-14 Example of an MPI subnet .........................................................................5-43
4-15 Example: Maximum distances in the MPI subnet ......................................5-44
4-16 Example of a PROFIBUS subnet ...............................................................5-45
4-17 Example: CPU 314C-2 DP as MPI and PROFIBUS nodes .......................5-46
4-18 Example of PG access across network boundaries (routing) ....................5-47
4-19 Installing the terminating resistors in an MPI subnet .................................5-48
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.............................................7-10
7-5 Slide the labeled strips into the front panel ................................................7-13
7-6 Shielding contact element underneath two signal modules.......................7-15
7-7 Connecting 2-wire cables to the shielding contact element.......................7-16
7-8 Bus connector: Enabled and disabled terminating resistor........................7-18
8-1 S7-300 slots and the associated module start addresses ...........................8-2
8-2 Addresses of the I/O of digital modules .......................................................8-4
8-3 I/O Addresses of a digital module in Slot 4 ..................................................8-5
8-4 I/O addresses of an analog module in Slot 4 ...............................................8-6
9-1 Connecting a PG to an S7-300 ....................................................................9-6
9-2 Connecting a PG to multiple S7-300 PLCs..................................................9-7
9-3 Connecting a PG to a subnet .......................................................................9-8
9-4 PG connected to an ungrounded S7-300.....................................................9-9
9-5 Insert the micro memory card into the CPU...............................................9-11
9-6 Using the mode selector switch to reset the memory ................................9-14
9-7 Intermediate memory in a DP CPU operating as a DP slave ....................9-29
9-8 Direct data exchange with CPUs 31x-2 DP/31xC-2 DP.............................9-33
10-1 Unlocking the front connector and removing the module...........................10-5
10-2 Removing the front connector coding pin...................................................10-6
10-3 Installing a new module..............................................................................10-7
10-4 Inserting the front connector ......................................................................10-8
10-5 Location of fuses in the digital output module 120/230 VAC ...................10-10

Siemens CPU 312C Specifications

General

Brand	Siemens
Model	CPU 312C
Category	Processor
Language	English