Siemens SIMATIC NET MODEM MD720 System Manual

Preface, Contents

Introduction

1

Inserting the SIM card

2

Connecting the device and
switching on the device

3

MODEM MD720 in Terminal
Mode

4

MODEM MD720 in OPC Mode

5

Service function

6

Technical Data

7

Glossary

Release 07/2013

SIMATIC NET

GPRS/GSM-Modem
MODEM MD720

System manual

DRAFT

Safety Guidelines

This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.

!

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

with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.

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
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.

Qualified Personnel

The device/system may only be set up and used in conjunction with this documentation. Commissioning and
operation of a device/system may only be performed by qualified personnel. Within the context of the safety notes
in this documentation qualified persons are defined as persons who are authorized to commission, ground and
label devices, systems and circuits in accordance with established safety practices and standards.

Prescribed Usage

Note the following:

!

Warning

This device may only be used for the applications described in the catalog or the technical description and only in
connection with devices or components from other manufacturers which have been approved or recommended by
Siemens. Correct, reliable operation of the product requires proper transport, storage, positioning and assembly
as well as careful operation and maintenance.

Trademarks

All names identified by ® are registered trademarks of the Siemens AG. The remaining trademarks in this

publication may be trademarks whose use by third parties for their own purposes could violate the rights of the
owner.

Disclaimer of Liability

We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

Siemens AG

Postfach 48 48
90437 NÜRNBERG
DEUTSCHLAND

Release 05/2006

Copyright © Siemens AG 2013
Technical data subject to change

2

!

Warning

The power supply unit to supply the MODEM MD720 must comply with NEC Class 2
circuits as outlined in the National Electrical Code (ANSI/NFPA 70) only.

General

The product MODEM MD720 complies with European standard EN60950-1 Safety of
Information Technology Equipment.
Read the installation instructions carefully before using the device.
Keep the device away from children, especially small children.
The device must not be installed or operated outdoors or at damp locations.
Do not operate the device if the connecting leads or the device itself are damaged.

External power supply

Use only an external power supply which also complies with EN60950-1. The output
voltage of the external power supply must not exceed 30VDC. The output of the
external power supply must be short-circuit proof.

When connecting to a battery or accumulator, make sure that an all-pole circuit­breaker (main battery switch) with sufficient selectivity and a fuse with sufficient
selectivity (e.g 32 V, 3A) are provided between the device and the battery or
accumulator.

Please pay regard to section 7 Technical Data of the system manual, as well as the
installation and utilization regulations of the respective manufacturers of the power
supply, the battery or the accumulator.

Handling cables

Never pull a cable connector out of a socket by its cable, but pull on the connector
itself. Cable connectors with screw fasteners (D-Sub) must always be screwed on
tightly. Do not lay the cable over sharp corners and edges without edge protection. If
necessary, provide sufficient strain relief for the cables.

For safety reasons, make sure that the bending radius of the cables is observed.
Failure to observe the bending radius of the antenna cable results in the deterioration

of the system's transmission and reception properties. The minimum bending radius
static must not fall below 5 times the cable diameter and dynamic below 15 times the
cable diameter.

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!

Warning

Never use the device in places where the operation of radio devices is prohibited. The
device contains a radio transmitter which could in certain circumstances impair the
functionality of electronic medical devices such as hearing aids or pacemakers. You
can obtain advice from your physician or the manufacturer of such devices. To prevent
data carriers from being demagnetized, do not keep disks, credit cards or other
magnetic data carriers near the device.

!

Warning

The emission limits as recommended by the Commission on Radiological Protection
(13/14 September 2001) must be observed.

Caution

The use of an outdoor antenna without adequate additional protection circuits is not
allowed. Installation must be done by a qualified person and in accordance to nationa
regulations.

Radio device

Installing antennas

Installing an external antenna

FCC Part 15

This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the
following measures:

 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment and receiver.
 Connect the equipment into an outlet on a circuit different from that to which

the receiver is connected.

 Consult the dealer / installer or an experienced radio/TV technician for help.

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Caution

Typically, the antenna connected to the transmitter is an omni-directional antenna with
0dB gain. Using this antenna the total composite power in PCS mode is smaller than 1
watt ERP.
The internal / external antennas used for this mobile transmitter must provide a
separation distance of at least 20 cm from all persons and must not be co-located
or operating in conjunction with any other antenna or transmitter."

Caution
This is a class B equipment. This equipment can disturb other electric equipment in

living areas; in this case the operator can be demanded to carry out appropriate
measures.

FCC Part 15.19

This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:

1. this device may not cause harmful interference, and

2. this device must accept any interference received, including interference that
may cause undesired operation.

FCC Part 15.21

Modifications not expressly approved by this company could void the user's authority
to operate the equipment.

Installation by qualified personnel only

You may only use the MODEM MD720 with an antenna of the MODEM MD720
accessory program.

The installation of the MODEM MD720 and the antenna as well as servicing is to be
performed by qualified technical personnel only. When servicing the antenna, or
working at distances closer than those listed below, ensure the transmitter has been
disabled.

RF Exposure mobile

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Caution

Please note that data packets exchanged for setting up connections, reconnecting,
connect attempts (e.g. Server switched off, wrong destination address, etc.) as well as
keeping the connection alive are also subject to charge.

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Preface

Purpose of this documentation

This documentation will support you on your way to successful application of
MODEM MD720. It will introduce you to the topic in clear and
straightforward steps and provide you with an overview of the hardware of
the MODEM MD720 GSM/GPRS modem. This documentation will help you
during installation and commissioning of SINAUT GSM/GPRS modem and
explains the diagnostics and service options available.

Validity of the documentation

This manual relates to the following product versions

 GPRS/GSM modem MD720 hardware release 1.x

SIMATIC Technical Support

You can contact Technical Support for all A&D products

 Phone: [phone]
 Fax: [phone]

You will find further information on our Technical Support on the Web at

http://www.siemens.com/automation/service

Service & Support on the Internet

In addition to our documentation services, you can also make use of all our
knowledge on the Internet:

http://www.siemens.com/automation/service&support

Here, you will find:

 Up-to-date product information (Updates), FAQs (Frequently Asked

Questions), Downloads, Tips and Tricks.

 The Newsletter keeps you constantly up to date with the latest

information on the products you use.

 The Knowledge Manager will find the documents you need.
 In the Forum, users and specialists exchange information and

experience.

 You can find your local contact for Automation & Drives in our contacts

database.

 You will find information on local service, repairs, spares and much more

under the rubric "Service".

You will find the latest version of this documentation under the entry ID

22549543.

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Preface

Do you still have questions relating to the use of the products described in
the manual? If so, then please talk to your local Siemens contact.

You will find the addresses in the following sources:

 On the Internet at: http://www.siemens.com/automation/partner
 On the Internet at http://www.siemens.com/simatic-net specifically for

SIMATIC NET products

 In the catalog CA 01
 In the catalog IK PI specifically for SIMATIC NET products

SIMATIC training center

To familiarize you with the systems and products, we offer a range of
courses. Please contact your regional training center or the central training
center in

D-90327 Nuernberg.

Phone: [phone]

http://www.sitrain.com

SIMATIC NET training center

For courses specifically on products from SIMATIC NET, please contact:

SIEMENS AG

Siemens AG, A&D Informations- und Trainings-Center

Dynamostr. 4

D-68165 Mannheim

Phone: [phone]

Fax: [phone]

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Contents

Preface .......................................................................................................................................... 7

1 Introduction ................................................................................................................... 11

2 Inserting the SIM card .................................................................................................. 13

3 Connecting the device and switching on the device ................................................ 14

4 MODEM MD720 in Terminal Mode ............................................................................. 19

4.1 Terminal mode activation................................................................................... 19

4.2 Operating requirements in Terminal Mode: GPRS subscriber contract ............ 20

4.3 Functions of the LEDs in Terminal Mode .......................................................... 20

4.4 Terminal mode operation ................................................................................... 21

4.5 Entering AT commands ..................................................................................... 22

4.6 Use AT commands ............................................................................................ 24

4.7 Supported AT commands in Terminal Mode ..................................................... 26

5 MODEM MD720 in OPC Mode ..................................................................................... 53

5.1 OPC Mode activation ......................................................................................... 54

5.2 Operating requirements in OPC Mode: GPRS subscriber contract .................. 54

5.3 Functions of the LEDs in OPC Mode ................................................................. 55

5.4 PIN in OPC-Mode .............................................................................................. 56

5.5 Log in to SINAUT MICRO SC ............................................................................ 58

6 Service functions .......................................................................................................... 59

6.1 Switching between Terminal mode and OPC Mode .......................................... 59

6.2 Getting the current settings and values ............................................................. 61

6.3 Load factory defaults ......................................................................................... 62

7 Technical Data .............................................................................................................. 63

Glossary ..................................................................................................................................... 67

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Contents

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1

Notice

You will find further information about the Terminal Mode and its use in
combination with TIM devices of the SINAUT ST7 system in the system manual of
the SINAUT ST7.

The MODEM MD720 has two different operation modes:

 Terminal Mode
 OPC Mode

The functional range and the functionality of the device are different in both modes.
The change between OPC Mode and Terminal Mode (refer to page 19 or page 54)
forces a restart of the device.

Terminal mode

The MODEM MD720 establishes radio data connections via a GSM network
(Global System for Mobile Communication).

 using modem connections via CSD (Circuit Switched Data),
 by sending SMS (Short Message Service).

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Introduction

Notice

You will find information about the OPC Mode in the system manual of the SINAUT
MICRO SC.

OPC-Modus

The MODEM MD720 transmits data over via a GSM radio network (Global System
for Mobile Communication).

 using GPRS (General Packet Radio Service) between S7-200 devices and an

 using SMS from a S7-200-device to any remote station, which can receive

Therefore the MODEM MD720 will be configured by program building blocks of the
connected PLC. The MODEM MD720 establishes autonomous the radio data
connection via GPRS between a S7-200 device and the OPC server SINAUT
MICRO SC.

OPC server SINAUT MICRO SC,

SMS.

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2

Notice

 The device must be switched off when you insert or change the SIM card.
 A plug-in SIM card (ID-000) is used.

Changing the SIM card

If you change the SIM card, please do not forget to update also the PIN number in
your application.

If you use a lot of SIM cards it can be helpful to set all PINs to the same PIN
number. You can do this i.e. by using a mobile phone. Please observe the security
requirements of your organization.

To insert the SIM card proceed as follows:

1. Make sure that the device is disconnected from the supply voltage.

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the device

3

1

Connector for supply voltage DC 24 V

2

Interface X1 (RS232) for the application or a service PC

3

SET button

4

LEDs: S (Status), Q (Quality), C (Connect)

5

Antenna connector

6, 9

Fixation for top rail mounting

7

SIM card holder tray

8

Button to access the SIM card

Connectors and LEDs

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Antenna

The antenna connector – SMA socket - is situated on the upper part of the front.
Impedance: approx. 50 Ohm

Caution

Please use only antennas of the MODEM MD720 accessory program. Other
antennas may disturb the product characteristics and may even cause defects.

Connectors for current supply

The screw terminals on the top of the device are for connecting the current supply:
24 V DC voltage (nominal), Ityp. 165mA at 24V. (Please also refer to chapter 7
Technical Data.) Both screw terminals on the left (24V) are internally connected,
see Fehler! Verweisquelle konnte nicht gefunden werden.. Both screw
terminals on the right (0V) are internally connected.

Connecting the device and switching on the device

.

Switching on

The devices switch on as soon as the operating voltage is supplied.

Functions of the LEDs

The MODEM MD720 has three LEDs, which are used to indicate the device
status. The function of the LEDs is different in terminal and OPC Mode. You will
find the explanation of the function

● in Terminal Mode in chapter 4.3 Functions of the LEDs in Terminal Mode and

● in OPC Mode in chapter 5.3 Functions of the LEDs in OPC Mode.

Serial interface X1

For data transmission:

Connect the application (e.g. machine, vending machine, sensor, computer) with
the interface X1 of the MODEM MD720. To connect, use a RS-232 cable.

If the application has a different interface, e.g. CAN, PPI cable or a different
industry bus, a commercially available interface converter can be connected
between it and the MODEM MD720.

OR

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Connecting the device and switching on the device

For configuration and service:

Connect the service PC via its serial interface (COM port). To connect, use a RS­232 cable.

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The SET button

Pushing the SET button

LED Status

Function

during operation for less
than 2 seconds



The LED „S“ (Status)

begins to light

Dump of current
settings and values
issued via the RS232
interface

during operation for 2-4
seconds



The LED „Q“ (Quality)

begins to light

Service mode to
download a new
firmware

during operation for more
than 4 seconds



Die LED „C“

(Connect) begins to
light

Load factory settings

By pushing the SET button for a certain period of time, you can configure the
device or activate different service modes.

Connecting the device and switching on the device

Top-hat rail mounting

The MODEM MD720 is suitable for top-hat rail mounting on DIN EN 50022 rails. A
corresponding bracket can be found at the rear of the device.

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Connecting the device and switching on the device

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4

In the Terminal Mode the MODEM MD720 operates like a GSM modem, which is
controlled by AT commands.

Supported are
 incoming and outgoing GSM data connections with 9600 bps with modems

being connected to the GSM network, the ISDN or the analogue telephone
network,

 sending of SMS (Short Message Service).

4.1 Terminal mode activation

Terminal mode is the factory default setting

The MODEM MD720 supports two fundamental operation modes:

 Terminal Mode,
 OPC Mode.

The MODEM MD720 is delivered by the factory with activated Terminal Mode.

Switching from OPC Mode into the Terminal Mode

If it is necessary to switch a manually the MODEM MD720 from OPC Mode into
the Terminal Mode, you will find the instructions for this in the chapter Switching
between Terminal mode and OPC Mode.

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MODEM MD720 in Terminal Mode

LED

Status

Meaning

S, Q, C
combined

Fast lighting in sequence

Boot procedure

Synchronous slow blinking

Service mode

Slow lighting in sequence

Update

Synchronous fast blinking

Error

S (Status)

Blinks slowly

Device waiting for PIN input

Blinks fast

PIN error / SIM error

Q (Quality)

Blinks slowly

Booking into GSM network

1x intermittent blinking

Field strength not sufficient

2x intermittent blinking

Field strength sufficient

3x intermittent blinking

Field strength medium

ON permanently

Field strength high

OFF

Waiting for PIN input

C (Connect)

Blinks

Terminal mode active

4.2 Operating requirements in Terminal Mode: GPRS
subscriber contract

To use the MODEM MD720 in Terminal Mode it is required:
 SIM card of a GSM network operator including CSD data service 9600 Bit/s

and an extra telephone number for data calls,

 Availability of a GSM network.

4.3 Functions of the LEDs in Terminal Mode

The device has 3 LEDs, which indicates the current operation status:
S (Status) Q (Quality) C (Connect)

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Blinks slowly: 1 time each second
Blinks fast: 4 times each second

4.4 Terminal mode operation

To operate the device the PIN (PIN = Personnel Identification Number) of the
inserted SIM card must be known. In the Terminal Mode the PIN is not stored in
the MODEM MD720. The PIN must be set again every time the device is turned­on.

● The PIN is set by AT commands.
If you use a PIN-less SIM card the PIN request is skipped.

Control by the application

Usually the application or the application software, which you execute on a
connected computer, will control the MODEM MD720. So wits, the commands to
establish or to disconnect a data connection via the GSM network, are given by the
application to the device. For this purpose the application and the device
communicates using AT commands, like other types of modems. The sending of
SMS is handled in the same way.

MODEM MD720 in Terminal Mode

Direct control using AT command

You can also enter manually AT commands to control the MODEM MD720. In this
case use any terminal program (Refer to Working with a terminal program.)

Or you write your own communication program which is adapted especially to your
purposes.

Enter the PIN first

Please enter the PIN first before any other AT commands. Until a PIN has been
entered most AT commands will be answered with ERROR.

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