Contents
S7-300 Programmable Controller Hardware and Installation
viii A5E00105492-01
Tables
2-1 S7-300 in S7 Technology..................................................................................2-1
2-2 Ambient influence on the PLC...........................................................................2-1
2-3 Potential isolation ..............................................................................................2-2
2-4 Communication between sensors/actuators and the PLC................................2-2
2-5 Application of central and distributed I/O ..........................................................2-2
2-6 Configuration consisting of the Central Unit (CU) and
Expansion Modules (EMs) ................................................................................2-2
2-7 CPU performance .............................................................................................2-3
2-8 Communications................................................................................................2-3
2-9 Software ............................................................................................................2-3
2-10 Supplementary features....................................................................................2-3
3-1 S7-300 modules ................................................................................................3-3
4-1 Profile rails - Overview ......................................................................................4-4
4-2 Module width .....................................................................................................4-4
4-3 Shielding terminals - Overview..........................................................................4-5
4-4 Interface modules - Overview ...........................................................................4-9
4-5 Cabinet types ..................................................................................................4-11
4-6 Cabinet selection.............................................................................................4-14
4-7 VDE specifications for the installation of a PLC system .................................4-15
4-8 Measures for protective grounding..................................................................4-21
4-9 Connecting the load voltage reference potential.............................................4-23
4-10 Characteristics of load power supplies ...........................................................4-26
4-11 Subnet nodes ..................................................................................................4-30
4-12 MPI/PROFIBUS-DP addresses.......................................................................4-31
4-13 MPI addresses of CPs/FMs in an S7-300.......................................................4-31
4-14 Connectable Devices ......................................................................................4-34
4-15 Available bus cables .......................................................................................4-34
4-16 Properties of PROFIBUS cables.....................................................................4-35
4-17 Marginal conditions for wiring interior bus cables ...........................................4-35
4-18 Bus connectors................................................................................................4-36
4-19 RS485 Repeater..............................................................................................4-36
4-20 PG patch cord .................................................................................................4-37
4-21 Permissible cable lengths in an MPI subnet segment ....................................4-38
4-22 Permissible cable lengths in an MPI subnet segment ....................................4-38
4-23 Lengths of stub cables per segment ...............................................................4-39
5-1 Module accessories ..........................................................................................5-2
5-2 Installation tools and materials..........................................................................5-3
5-3 Mounting holes for profile rails ..........................................................................5-5
5-4 Slot numbers for S7 modules............................................................................5-9
6-1 Wiring accessories ............................................................................................6-1
6-2 Tools and material for wiring.............................................................................6-2
6-3 Conditions for wiring the PS and CPU..............................................................6-2
6-4 Wiring conditions for front connectors...............................................................6-2
6-5 Assigning front connectors to modules.............................................................6-8
6-6 Wiring front connectors ...................................................................................6-10
6-7 Inserting the front connector ...........................................................................6-11
6-8 Assigning labeling strips to modules...............................................................6-12
6-9 Specifying the shielding diameter for shielding terminals...............................6-13
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