Siemens Simatic S7-1500 User manual

CM PtP RS422/485 BA communication
module (6ES7540 
‑1AB00‑0AA0)
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SIMATIC
S7-1500/ET 200MP
CM PtP RS422/485 BA
communication module
(6ES7540‑1AB00‑0AA0)
Manual
01/2013
A5E03777484-01
Preface
Documentation guide
1
Product overview
2
Connecting
3
Parameters/address space
4
Programming
5
Error and system messages
6
Technical specifications
7
Dimensional drawing
A

Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E03777484-01
Ⓟ 12/2012 Technical data subject to change
Copyright © Siemens AG 2013.
All rights reserved
Legal information
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editions.

CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
Manual, 01/2013, A5E03777484-01 3
Preface
Purpose of the documentation
This device manual complements the system manual S7 1500 Automation System
(http://support.automation.siemens.com/WW/view/en/59191792). General functions of the
S7-1500 are described in the S7-1500 Automation System System Manual.
Conventions
This documentation contains figures of the described device. The figures may differ slightly
from the devices supplied.
Please also observe notes marked as follows:
Note
A note contain important information on the product described in the documentation, on the
handling of the product and on the section of the documentation to which particular attention
should be paid.
Note on IT security
Siemens offers IT security mechanisms for its automation and drive product portfolio in order
to support the safe operation of the plant/machine. We recommend that you inform yourself
regularly on the IT security developments regarding your products. You can find information
on this on the Internet (http://support.automation.siemens.com).
You can register for a product-specific newsletter here.
For the safe operation of a plant/machine, however, it is also necessary to integrate the
automation components into an overall IT security concept for the entire plant/machine,
which corresponds to the state-of-the-art IT technology. You can find information on this on
the Internet (http://www.siemens.com/industrialsecurity).
Products used from other manufacturers should also be taken into account here.

Preface
CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
4 Manual, 01/2013, A5E03777484-01
Copyright notice for the open-source software used
Open-source software is used in the firmware of the product described. The open-source
software is provided free of charge. We are liable for the product described, including the
open-source software contained in it, pursuant to the conditions applicable to the product.
Siemens accepts no liability for the use of the open source software over and above the
intended program sequence, or for any faults caused by modifications to the software.
For legal reasons, we are obliged to publish the original text of the following copyright
notices.
© Copyright William E. Kempf 2001
Permission to use, copy, modify, distribute and sell this software and its documentation for
any purpose is hereby granted without fee, provided that the above copyright notice appear
in all copies and that both that copyright notice and this permission notice appear in
supporting documentation. William E. Kempf makes no representations about the suitability
of this software for any purpose. It is provided "as is" without express or implied warranty.
Copyright © 1994 Hewlett-Packard Company
Permission to use, copy, modify, distribute and sell this software and its documentation for
any purpose is hereby granted without fee, provided that the above copyright notice appear
in all copies and that both that copyright notice and this permission notice appear in
supporting documentation. Hewlett-Packard Company makes no representations about the
suitability of this software for any purpose. It is provided ``as is'' without express or implied
warranty.

CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
Manual, 01/2013, A5E03777484-01 5
Table of contents
Preface ...................................................................................................................................................... 3
1 Documentation guide................................................................................................................................. 7
2 Product overview ....................................................................................................................................... 9
2.1 Properties.......................................................................................................................................9
2.2 Accessories..................................................................................................................................11
2.3 Functions......................................................................................................................................12
2.4 Properties of the RS422/485 interface.........................................................................................14
3 Connecting .............................................................................................................................................. 15
3.1 RS422/485 (X27) interface of the communication module..........................................................15
3.2 Installation guidelines...................................................................................................................16
4 Parameters/address space...................................................................................................................... 17
4.1 Parameter assignment.................................................................................................................17
4.2 Reaction to CPU STOP ...............................................................................................................17
4.3 Address space .............................................................................................................................18
5 Programming ........................................................................................................................................... 19
6 Error and system messages .................................................................................................................... 21
7 Technical specifications........................................................................................................................... 23
A Dimensional drawing ............................................................................................................................... 27

Table of contents
CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
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CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
Manual, 01/2013, A5E03777484-01 7
Documentation guide 1
Introduction
This modular documentation of the SIMATIC products covers diverse topics concerning your
automation system.
The complete documentation for the S7-1500 and ET 200MP automation systems consists
of system manuals, function manuals and manuals.
The STEP 7 information system (Online Help) also helps you configure and program your
automation system.
Overview of the documentation provided for the CM PtP RS422/485 BA communication module
The following table lists additional references that you will need when using the
CM PtP RS422/485 BA communication module.
Table 1- 1 Documentation for the CM PtP RS422/485 BA communication module
Topic Documentation Key content
System manual S7 -1500 Automation System
(http://support.automation.siemens.com/WW/vi
ew/en/59191792)
System manual ET 200MP distributed I/O
system
(http://support.automation.siemens.com/WW/vi
ew/en/59193214)
System manual ET 200SP distributed I/O
system
(http://support.automation.siemens.com/WW/vi
ew/en/58649293)
•Application planning
•Installation
•Connecting
•Addressing
•Commissioning
•Maintenance
Power supply manuals
(http://support.automation.siemens.com/WW/vi
ew/en/59173914)
CPU manuals
(http://support.automation.siemens.com/WW/vi
ew/en/56926947)
•Connecting
•Interrupt, error and
system messages
•Technical specifications
•Dimensional drawing
System description
Function manual EMC/EMI compatible
installation of control systems
(http://support.automation.siemens.com/WW/vi
ew/en/59193566)
•Basics
•Electromagnetic
compatibility
•Lightning protection

Documentation guide
CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
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Topic Documentation Key content
Point-to-point
communication
Function manual CM PtP - Configurations for
point-to-point connections
(http://support.automation.siemens.com/WW/vi
ew/en/59057093)
•Basic information
•Data transmission
functions
•Diagnostics functions
SIMATIC manuals
All current manuals for the SIMATIC products are available for download free of charge on
the Internet (http://www.siemens.com/automation/service&support).

CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
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Product overview 2
2.1 Properties
Order number
6ES7540-1AB00-0AA0
View of the module
Figure 2-1 CM PtP RS422/485 BA view

Product overview
2.1 Properties
CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
10 Manual, 01/2013, A5E03777484-01
Properties
The communication module has the following properties:
● Technical properties
– RS422/485 interface
– short-circuit proof
– electrically disconnected
– Protocols: 3964(R), Freeport and USS with instructions
● Supported system functions
– Firmware update
– Identification data I&M0
– Parameter re-assignment in CPU RUN mode (using instructions)
– Diagnostic interrupts
Additional information
Additional information on the properties of the CM PtP RS422/485 BA can be found in the
function manual CM PtP - Configurations for point-to-point connections
(http://support.automation.siemens.com/WW/view/en/59057093).
Additional information on the properties of the S7-1500 and associated modules can be
found in the system manual S7 -1500 Automation System
(http://support.automation.siemens.com/WW/view/en/59191792).

Product overview
2.2 Accessories
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2.2 Accessories
Scope of delivery
The scope of delivery of the communication module includes a U connector for connection to
the backplane bus.
Connecting cables
Connecting cables are available in the standard lengths: 5 m, 10 m and 50 m (each with a
15-pin sub D connector).
Table 2- 1 Order numbers of connecting cables
Connecting cables for
CM PtP RS422/485 BA
CM PtP RS422/485 HF
Type Order number
X27 (RS 422), 5 m 6ES7902–3AB00–0AA0
X27 (RS 422), 10 m 6ES7902–3AC00–0AA0
X27 interface (RS422/485)
X27 (RS 422), 50 m 6ES7902–3AG00–0AA0
Online catalog
Additional order numbers for S7-1500 can be found on the Internet
(http://www.siemens.com/industrymall) in the online catalog and online ordering system.

Product overview
2.3 Functions
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2.3 Functions
Introduction
The communication module allows you to exchange data between your own and other
programmable controllers or computers by means of a point-to-point connection, and to
connect various devices from a variety of manufacturers.
Functionality of the CM PtP RS422/485 BA
The CM PtP RS422/485 BA communication module offers the following functionality:
● RS422/485 interface
● Data transmission rate: 300 to 19200 bps
● Maximum frame length: 1 kbyte
● Transmission protocols: Freeport and 3964(R)
Note
The USS protocol can be implemented with instructions included in STEP 7 (TIA Portal).
Hardware components of a point-to-point connection
You require certain hardware components for a point-to-point connection with the
CM PtP RS422/485 BA.
Components Function
Central processor unit (CPU)
Accessories: Memory card
... executes the user program.
CM PtP RS422/485 BA communication module ... communicates with a communication partner (point-to-point) by
means of the interface.
Connecting cable ... connects the CM PtP RS422/485 BA communication module with
the communication partner.
U connector ... provides the mechanical and electrical connection between the
modules.
Optional: Power supply module (PS) ... converts the line voltage (120/230 VAC or 24 VDC) into the
operating voltage of 15 VDC required for supply of the S7-1500.

Product overview
2.3 Functions
CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
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System environment
The communication module can be used in the following system environments:
Applications Components required Configuration
Central operation in an S7-1500
system
•CPU 151x
•CM PtP RS422/485 BA
•Power supply (optional)
STEP 7 (TIA Portal)
Distributed operation in an S7-1500
system
•CPU 151x
•IM 155-5
•CM PtP RS422/485 BA
•Power supply (optional)
STEP 7 (TIA Portal)
Distributed operation in an S7-300/400
system
•CPU 31x / CPU 41x
•IM 155-5
•CM PtP RS422/485 BA
STEP 7 (TIA Portal)
STEP 7 with integration of a GSD file
Distributed operation in a third-party
system
•Third-party programmable controller
•IM 155-5
•CM PtP RS422/485 BA
GSD file imported to/installed in the
engineering system 1)
1) Information on using the communication module in a third-party system is available in the
programming and operating manual CM PtP operation with PROFINET controller
(http://support.automation.siemens.com/WW/view/en/59062563).
Additional information
Information on configuring and programming the CM PtP RS422/485 BA communication
module is available in the function manual CM PtP - Configurations for point-to-point
connections (http://support.automation.siemens.com/WW/view/en/59057093).

Product overview
2.4 Properties of the RS422/485 interface
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2.4 Properties of the RS422/485 interface
Definition
The RS422/485 (X27) interface is a differential voltage interface for serial data transmission.
Properties
The RS422/485 (X27) interface has the following properties and meets the following
requirements:
Type Differential voltage interface
Front connector: 15-pin sub-D female connector, with screw lock
RS422 signals: T (A), R (A), T (B), R (B), GND; isolated
RS485 signals: R/T (A), R/T (B), GND; all signals isolated against backplane bus and load
voltage
Max. data transmission
rate:
19.2 kbps
Max. cable length: 1200 m; cable type LIYCY 3 x 2 x 0.14. T(A)/T(B) and R(A)/R(B) twisted in
pairs
Standard: DIN 66259 Parts 1 and 3, EIA-RS422/485, CCITT V.11

CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
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Connecting 3
3.1 RS422/485 (X27) interface of the communication module
Terminal assignment
The table below shows the terminal assignment for the 15-pin sub D female connector in the
front panel of the communication module.
Table 3- 1 Terminal assignment for the 15-pin sub D female connector of the integrated interface of the communication
module
RS422/485* female
connector
Pin Designation Input/output Meaning
1 - - -
2 T (A) - Output Send data (four-wire mode)
3 - - -
4 R (A)/T (A) - Input
Input/output
Receive data (four-wire mode)
Receive/send data (two-wire mode)
5 - - -
6 - - -
7 - - -
8 GND - Functional ground (isolated)
9 T (B) + Output Send data (four-wire mode)
10 - - -
11 R (B)/T (B) + Input
Input/output
Receive data (four-wire mode)
Receive/send data (two-wire mode)
12 - - -
13 - - -
14 - - -















15 - - -
* View from the front

Connecting
3.2 Installation guidelines
CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
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Connecting cables
Standard connecting cables of various lengths (see chapter Accessories (Page 11)) are
available for connection with a communication partner which also has a 15-pin sub-D female
connector.
Please note that you must only use shielded connector casings and cables. A large surface
area of the cable shield must be in contact with the connector casing on both sides.
CAUTION
Cable shield - GND
Never connect the cable shield to the GND, as this could destroy the modules. GND (pin 8)
must always be connected on both sides, as this could otherwise also destroy the modules.
3.2 Installation guidelines
To take into consideration
The general installation guidelines must be taken into consideration (see function manual
EMC/EMI compatible installation of control systems
(http://support.automation.siemens.com/WW/view/en/59193566)).
The cable shield must be installed on a grounding rail to maintain the EMC values
(electromagnetic compatibility).

CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
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Parameters/address space 4
4.1 Parameter assignment
Introduction
You configure and assign the parameters of the communication module with STEP 7
(TIA Portal V12 or later) or with STEP 7 with integration of a GSD file.
Additional information
The device manual of the communication module is supplemented by the function manual
CM PtP - Configurations for point-to-point connections
(http://support.automation.siemens.com/WW/view/en/59057093) and the TIA Portal
information system.
There you will find information on the following topics:
● Operating modes
● Receive buffer
● Data flow control
● Transmission integrity
● Data transmission - protocol specific
● Programming/configuring in STEP 7 (TIA Portal)
● Module-specific instructions
● Diagnostics
4.2 Reaction to CPU STOP
Ongoing transmissions are aborted when the higher-level control (CPU) goes to STOP.
Frames in the receive buffer are retained. With a corresponding configuration in the
properties dialog of the communication module, you can automatically clear the receive
buffer on the communication module during CPU startup.

Parameters/address space
4.3 Address space
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4.3 Address space
Address space of the communication module
The input addresses of the communications module total 8 bytes. The input addresses are
automatically assigned for each communications module when you specify the device
configuration in STEP 7 (TIA Portal). Output addresses are not required.
Hardware identification (not freely configurable)
The hardware identification (HW ID) is automatically assigned for each communications
module when you specify the device configuration in STEP 7 (TIA Portal).
The hardware ID is issued along with the diagnostic messages to localize the module. In
addition, the HW identification is required for S7-1500 at the communication instructions in
order to identify the communication module. For S7-300/400, the communication module is
identified by the start address of the input data.

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Programming 5
Overview of the instructions
Communication between the CPU, the communication module and a communication partner
takes place by means of special instructions and protocols that support the corresponding
communication modules. The instructions process the exchange of data between the CPU
and the communication module. They must be called cyclically from the user program. Data
transmission takes place asynchronously across several cycles.
The transmission protocols are implemented on the communication module. The protocol is
used to adapt the interface of the communication module to the interface of the
communication partner.
Instruction Meaning
Port_Config You use the Port_Config instruction to dynamically assign basic interface
parameters.
Send_Config You use the Send_Config (send configuration) instruction to dynamically
assign serial send parameters of a protocol.
Receive_Config You use the Receive_Config (receive configuration) instruction to
dynamically assign serial receive parameters of a protocol.
P3964_Config You use the P3964_Config (protocol configuration) instruction to
dynamically assign the parameters of the 3964(R) procedure.
Send_P2P You use the Send_P2P instruction to send data to a communication partner.
Receive_P2P You use the Receive_P2P instruction to receive data from a communication
partner.
Receive_Reset You use the Receive_Reset instruction to delete the receive buffer of the
communication module.
Get_Features You use the Get_Features instruction to read expanded functions supported
by the communication module.
Set_Features You use the Set_Features instruction to set expanded functions supported
by the communication module.
USS_Port_Scan You use the USS_Port_Scan instruction to communicate using the USS.
USS_Drive_Control You use the USS_Drive_Control instruction to exchange data with a drive.
USS_Read_Param You use the USS_Read_Param instruction to read parameters from the
drive.
USS_Write_Param You use the USS_Write_Param instruction to change parameters in the
drive.
The instructions are part of STEP 7 (TIA Portal). The instructions are available in the "Instructions"
task card under Communication > Communication processor.

Programming
CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
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Additional information
Additional information on programming the communication modules can be found in the
function manual CM PtP - Configurations for point-to-point connections
(http://support.automation.siemens.com/WW/view/en/59057093).