Siemens CSM 1277 User manual

1
Introduction
2
Network topologies
3
Product characteristics
SIMATIC NET 4
Mounting
S7-1200
Compact Switch Module
CSM 1277
5
Approvals and markings
6
References
Operating Instructions 7
Graphics
V. 1.20
A2B00079397B

Legal information
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DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
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CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
NOTICE
indicates that an unintended result or situation can occur if the corresponding information is not taken into
account.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
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property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
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Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
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Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
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information in this publication is reviewed regularly and any necessary corrections are included in subsequent
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Siemens AG order number: A2B00079397B Copyright © Siemens AG 2009, 2010.
Industry Sector Ⓟ 08/2010 Technical data subject to change
Postfach 48 48
90026 NÜRNBERG
GERMANY

Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 3
Table of contents
1 Introduction................................................................................................................................................ 5
1.1 Preface...........................................................................................................................................5
1.2 Introduction ....................................................................................................................................7
2 Network topologies .................................................................................................................................... 9
2.1 Network topologies ........................................................................................................................9
3 Product characteristics ............................................................................................................................ 11
3.1 Components of the product..........................................................................................................11
3.2 Unpacking and checking..............................................................................................................11
3.3 CSM 1277 product characteristics...............................................................................................12
3.4 TP ports........................................................................................................................................13
3.5 Displays........................................................................................................................................15
3.6 Technical specifications ...............................................................................................................16
4 Mounting.................................................................................................................................................. 19
4.1 Installation....................................................................................................................................19
4.2 Fixing onto standard mounting rails.............................................................................................20
4.3 Power supply................................................................................................................................22
4.4 Grounding ....................................................................................................................................23
4.5 Twisted pair cable........................................................................................................................23
4.6 Fitting the IE FC RJ-45 Plug 180 .................................................................................................24
4.7 Possible sources of problems and how to deal with them...........................................................25
5 Approvals and markings .......................................................................................................................... 27
5.1 Notes on the CE Mark..................................................................................................................27
6 References .............................................................................................................................................. 29
6.1 References...................................................................................................................................29
6.2 Internet.........................................................................................................................................29
7 Graphics .................................................................................................................................................. 31
7.1 Dimension drawings.....................................................................................................................31
Glossary .................................................................................................................................................. 33
Index........................................................................................................................................................ 35

Table of contents
Compact Switch Module CSM 1277
4 Operating Instructions, V. 1.20, A2B00079397B

Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 5
Introduction 1
1.1 Preface
Overview
This section provides you with an overview of the functions of the unmanaged compact
switch module CSM 1277.
Purpose of the Commissioning Manual
This commissioning manual supports you when commissioning networks with the compact
switch module CSM 1277.
Validity of this Commissioning Manual
This commissioning manual is valid for the following device:
CSM 1277
6GK7277-1AA10-0AA0
Further documentation
The "SIMATIC NET Industrial Ethernet Twisted Pair and Fiber Optic Networks" manual
contains additional information on other SIMATIC NET products that you can operate along
with the CSM 1277 switch in an Industrial Ethernet network.
Finding information
To help you to find the information you require more quickly, the manual includes not only
the table of contents but also the following sections in the Appendix:
● Index
● Glossary
Audience
This commissioning manual is intended for personnel involved in the commissioning of
networks with the CSM 1277 compact switch module.

Introduction
1.1 Preface
Compact Switch Module CSM 1277
6 Operating Instructions, V. 1.20, A2B00079397B
Standards and approvals
The CSM 1277 compact switch module meets the requirements for the CE, UL, C-Tick, FM
and ATEX marks. You will find detailed information in the section "Approvals and Markings"
in this commissioning manual in the "Approvals" table.
Note
The specified approvals apply only when the corresponding mark is printed on the product.

Introduction
1.2 Introduction
Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 7
1.2 Introduction
What is possible?
The CSM 1277 device allows the cost-effective installation of Industrial Ethernet bus or star
structures with switching functionality.
Note
It is not possible to use the CSM 1277 switch in a redundant ring because it does not support
redundancy.
Note
If the CSM 1277 switch is supplied over long 24 V power supply lines or networks, measures
are necessary to prevent interference by strong electromagnetic pulses on the supply lines.
These can result, for example, due to lightning or switching of large inductive loads.
One of the tests used to attest the immunity of the switch to electromagnetic interference
was the "surge immunity test" according to EN61000-4-5. This test requires overvoltage
protection for the power supply lines. A suitable device is, for example, the Dehn Blitzductor
VT AD 24 V type no. 918 402 or comparable protective element.
Manufacturer:
DEHN+SÖHNE GmbH+Co.KG Hans Dehn Str.1 Postfach 1640 D-92306 Neumarkt,
Germany
WARNING
When used under hazardous conditions (zone 2), the CSM 1277 switch must be installed in
an enclosure.
To comply with ATEX 95 (EN 60079-15), this enclosure must be at least IP54 in
compliance with EN 60529.
WARNING – EXPLOSION HAZARD: DO NOT DISCONNECT EQUIPMENT WHEN A
FLAMMABLE OR COMBUSTIBLE ATMOSPHERE IS PRESENT.

Introduction
1.2 Introduction
Compact Switch Module CSM 1277
8 Operating Instructions, V. 1.20, A2B00079397B

Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 9
Network topologies 2
2.1 Network topologies
Switching technology allows extensive networks to be set up with numerous nodes and
simplifies network expansion.
Which topologies can be implemented?
Linear (bus) and star topologies can be implemented with the compact switch module
CSM 1277.
Note
Make sure that the maximum permitted cable lengths for the relevant devices are not
exceeded. You will find the permitted cable lengths in the technical specifications.
Bus topology
Figure 2-1 Bus topology with the CSM 1277

Network topologies
2.1 Network topologies
Compact Switch Module CSM 1277
10 Operating Instructions, V. 1.20, A2B00079397B
Star topology
Figure 2-2 Star topology. Example with the CSM 1277

Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 11
3
Product characteristics
3.1 Components of the product
The CSM 1277 compact switch module ships with the following:
● 3-pin terminal block (power supply)
● Operating Instructions (on the CD)
● CD
3.2 Unpacking and checking
Unpacking, checking
1. Make sure that the package is complete.
2. Check all the parts for transport damage.
WARNING
Do not use any parts that show evidence of damage!

Product characteristics
3.3 CSM 1277 product characteristics
Compact Switch Module CSM 1277
12 Operating Instructions, V. 1.20, A2B00079397B
3.3 CSM 1277 product characteristics
Possible attachments
The CSM 1277 has four RJ-45 jacks for the connection of end devices or other network
segments.
Figure 3-1 Compact Switch Module CSM 1277

Product characteristics
3.4 TP ports
Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 13
3.4 TP ports
Connector pinout
On the CSM 1277, the TP ports are implemented as RJ-45 sockets with MDI-X assignment
(Medium Dependent Interface–Autocrossover) of a network component.
Figure 3-2 RJ-45 jacks
Figure 3-3 RJ-45 jack
Table 3- 1 Pin assignment of the RJ-45 jack
Pin number Assignment
Pin 8 n. c.
Pin 7 n. c.
Pin 6 TD-
Pin 5 n. c.
Pin 4 n. c.
Pin 3 TD+
Pin 2 RD-
Pin 1 RD+

Product characteristics
3.4 TP ports
Compact Switch Module CSM 1277
14 Operating Instructions, V. 1.20, A2B00079397B
NOTICE
TP cords or TP-XP cords with a maximum length of 10 m can be connected to the RJ-45
TP port.
With the IE FC cables and IE FC RJ-45 plug 180, an overall cable length of up to 100 m is
permitted between two devices depending on the cable type.
Autonegotiation
Autonegotiation means the automatic detection of the functionality of the port at the opposite
end. Using autonegotiation, network components or end devices can detect the functionality
available at the port of a partner device allowing automatic configuration of different types of
device. With autonegotiation, two components connected to an Ethernet segment can
exchange parameters and set themselves to match the supported communication
functionality.
Note
Devices not supporting autonegotiation must be set to 100 Mbps/ half duplex or 10 Mbps hal
f
duplex.
Note
The CSM 1277 is a plug-and-play device that does not require settings to be made for
commissioning.
Auto polarity exchange
If the pair of receiving cables are incorrectly connected (RD+ and RD- swapped over), the
polarity is adapted automatically.
MDI /MDIX autocrossover function
The advantage of the MDI /MDIX autocrossover function is that straight-through cables can
be used throughout and crossover Ethernet cables are unnecessary. This prevents
malfunctions resulting from mismatching send and receive wires. This makes installation
much easier for the user.
Insulation between the ports
There are two port groups:
Group1: P1 and P2
Group2: P3 and P4
Between ports of different port groups, an insulation voltage of 1.5 kV is adhered to
(corresponds to IEEE802.3 Section 33.4.1.1, Environment B). For example between P1 and
P4.

Product characteristics
3.5 Displays
Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 15
Between ports of the same group, the requirements for Environment A are met. For example
between P1 and P2.
NOTICE
Please note that the direct connection of two ports on the switch or accidental connection
over several switches causes an illegal loop. Such a loop can lead to network overload and
network failures.
3.5 Displays
Displays of the CSM 1277
Power indicator 'DIAG' (green LED)
The status of the power supply is indicated by a green LED:
Status Meaning
LED lit green Power supply is connected
LED not lit Power supply is not connected or the applied voltage is too low.
Refer to the Note in Section 4.7
Port status indicators 'P1' to 'P4' (green LEDs)
The status of the ports is indicated by four green LEDs. These are below the top panel. See
also Figure 4-4
Status Meaning
Port 1 through 4 LED lit Existing connection via port to Industrial Ethernet (LINK status)
Port 1 through 4 LED flashing Port is sending / receiving via Industrial Ethernet
Ports 1 through 4 LEDs flashing / in
sequence
Test phase during power on

Product characteristics
3.6 Technical specifications
Compact Switch Module CSM 1277
16 Operating Instructions, V. 1.20, A2B00079397B
3.6 Technical specifications
Technical specifications of the CSM 1277
Connectors
Attachment of end devices or network
components over twisted pair
4 x RJ-45 sockets with MDI-X pinning
10/100 Mbps (half/ full duplex), floating
Connector for power supply 3-pin plug-in terminal block
Electrical data
Power supply Power supply 24 V DC (limit: 19.2 to 28.8 V DC)
safety extra-low voltage (SELV)
Functional ground
Power loss at 24 V DC 1.6 W
Current consumption at rated voltage 70 mA
Overvoltage protection at input PTC resettable fuse (0.5 A / 60 V)
Permitted cable lengths
Connection over Industrial Ethernet FC TP cables
0 – 100 m
0 – 85 m
Industrial Ethernet FC TP standard cable with IE
FC RJ-45 plug 180
or
over Industrial Ethernet FC outlet RJ-45 with 0 -
90 m Industrial Ethernet FC TP standard cable +
10 m TP cord
Industrial Ethernet FC TP marine/trailing cable
with IE FC RJ-45 plug 180
or
0 - 75 m Industrial Ethernet FC TP marine/trailing
cable + 10 m TP cord
learnable MAC addresses / Aging Time
learnable MAC addresses 2048
Aging time 280 seconds
Permitted ambient conditions
Operating temperature 0°C through +60°C
Storage/transport temperature -40°C through +70°C
Relative humidity in operation ‹ 95% (no condensation)
Operating altitude 2000 m at max 56 °C ambient temperature
3000 m at max. 50 °C ambient temperature
Immunity EN 61000-6-2
Emission EN 61000-6-4
Degree of protection IP20
MTBF
MTBF 273 years

Product characteristics
3.6 Technical specifications
Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 17
Permitted ambient conditions
Construction
Dimensions (W x H x D) in mm 45 x 100 x 76
Weight in g 150
Installation options 35 mm DIN rail (DIN EN 60715 TH35)
Order numbers
CSM 1277 6GK7277-1AA10-0AA0
"Industrial Ethernet TP and Fiber Optic Networks"
manual
6GK1970-1BA10-0AA0
TP Cord RJ-45/RJ-45, 0.5 m 6XV1870-3QE50
TP Cord RJ-45/RJ-45, 1 m 6XV1870-3QH10
TP Cord RJ-45/RJ-45, 2 m 6XV1870-3QH20
TP Cord RJ-45/RJ-45, 6 m 6XV1870-3QH60
TP Cord RJ-45/RJ-45, 10 m 6XV1870-3QN10
IE FC Stripping Tool 6GK1901-1GA00
IE FC blade cassettes 6GK1901-1GB00
IE FC TP standard cable 6XV1840 2AH10
IE FC TP trailing cable 6XV1840-3AH10
IE FC TP marine cable 6XV1840-4AH10
IE FC RJ-45 Plug 180 pack of 1 6GK1 901-1BB10-2AA0
IE FC RJ-45 Plug 180 pack of 10 6GK1 901-1BB10-2AB0
IE FC RJ-45 Plug 180 pack of 50 6GK1 901-1BB10-2AE0
Note
The number of connected switches influences the frame delay.
When a frame passes through the CSM 1277, it is delayed by the store and forward function
of the switch
- with a 64 byte frame length by approx. 8 µs (at 100 Mbps)
- with a 1500 byte frame length by approx. 125 µs (at 100 Mbps)
This means that the more CSM 1277 switches that a frame passes through, the higher the
frame delay will be.

Product characteristics
3.6 Technical specifications
Compact Switch Module CSM 1277
18 Operating Instructions, V. 1.20, A2B00079397B

Compact Switch Module CSM 1277
Operating Instructions, V. 1.20, A2B00079397B 19
4
Mounting
4.1 Installation
Type of mounting
The CSM 1277 compact switch module is intended for mounting on a 35 mm DIN rail. Wall
mounting is possible (see S7-1200 System Manual).
Note
When installing and operating the device, keep to the installation instructions and safety-
related notices as described here and in the manual SIMATIC NET Industrial Ethernet
Twisted Pair and Fiber Optic Networks /1/.
Note
Provide suitable shade to protect the device against direct sunlight. This avoids unwanted
warming of the device and prevents premature aging of the device and cabling.
WARNING
If temperatures in excess of 70 °C occur on the cable or at the cable feed-in point, or the
temperature at the branching point of the cables exceeds 80 °C, special measures need to
be taken. If the equipment is operated at an ambient temperature of 50°C - 60°C, use
cables with a permitted ambient temperature of at least 80°C.
WARNING
Protective measures must be taken to avoid the rated voltage of the equipment being
exceeded by more than 40% by transient overvoltages. This is the case if the equipment is
supplied exclusively by SELV circuits.
WARNING
If the CSM 1277 is operated in an ambient temperature of more than 55 °C, the
temperature of the device housing may be higher than 70 °C.
The subject unit must be located in a Restricted Access Location where access can only be
gained by SERVICE PERSONNEL or by USERS who have been instructed about the
reasons for the restrictions applied to the location and about any precautions that shall be
taken when operated in an air ambient in excess of 55 °C.

Mounting
4.2 Fixing onto standard mounting rails
Compact Switch Module CSM 1277
20 Operating Instructions, V. 1.20, A2B00079397B
4.2 Fixing onto standard mounting rails
Installation on a 35 mm DIN rail
Note
The CSM 1277 does not have a feedthrough for the backplane bus. It must therefore be
mounted either at the start or end of the S7-1200 station!
1. Place the upper guide at the top of the CSM housing in the 35 mm DIN rail (DIN EN
60715 TH35 ).
2. Push in the lower part of the CSM 1277 onto the rail until it locks in place.
Figure 4-1 Mounting the CSM 1277 on a DIN rail