Siemens SIMATIC S7-200 System Manual page 324

S7-200 Programmable Controller System Manual
Table 10-3 shows the Modbus addresses
supported by the Modem module, and the
mapping of Modbus addresses to the
S7-200 CPU addresses.
Use the Modem Expansion wizard to create
a configuration block in for the Modem
module to support Modbus RTU protocol.
The Modem module configuration block
must be downloaded to the CPU data block
before you can use the Modbus protocol.
Paging and SMS Messaging
The Modem module supports sending numeric and text paging messages, and SMS (Short
Message Service) messages to cellular phones (where supported by the cellular provider). The
messages and telephone numbers are stored in the Modem module configuration block which
must be downloaded to the data block in the S7-200 CPU. You can use the Modem Expansion
wizard to create the messages and telephone numbers for the Modem module configuration
block. The Modem Expansion wizard also creates the program code to allow your program to
initiate the sending of the messages.
Numeric Paging
Numeric paging uses the tones of a touch tone telephone to send numeric values to a pager. The
Modem module dials the requested paging service, waits for the voice message to complete, and
then sends the tones corresponding to the digits in the paging message. The digits 0 through 9,
asterisk (*), A, B, C and D are allowed in the paging message. The actual characters displayed by
a pager for the asterisk and A, B, C, and D characters are not standardized, and are determined
by the pager and the paging service provider.
Text Paging
Text paging allows alphanumeric messages to be transmitted to a paging service provider, and
from there to a pager. Text paging providers normally have a modem line that accepts text pages.
The Modem module uses Telelocator Alphanumeric Protocol (TAP) to transmit the text messages
to the service provider. Many providers of text paging use this protocol to accept messages.
Short Message Service (SMS)
Short Message Service (SMS) messaging is supported by some cellular telephone services,
generally those that are GSM compatible. SMS allows the Modem module to send a message
over an analog telephone line to an SMS provider. The SMS provider then transmits the message
to the cellular telephone, and the message appears on the text display of the telephone. The
Modem module uses the Telelocator Alphanumeric Protocol (TAP) and the Universal Computer
Protocol (UCP) to send messages to the SMS provider. You can send SMS messages only to
SMS providers that support these protocols on a modem line.
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Table 10-3 Mapping Modbus Addresses to the S7-200
CPU
Modbus Address
000001
000002
000003
...
000127
000128
010001
010002
010003
...
010127
010128
030001
030002
030003
...
030032
040001
040002
040003
...
04xxxx
S7-200 CPU Address
Q0.0
Q0.1
Q0.2
...
Q15.6
Q15.7
I0.0
I0.1
I0.2
...
I15.6
I15.7
AIW0
AIW2
AIW4
...
AIW62
VW0
VW2
VW4
...
VW 2*(xxxx- -1)