Siemens Simatic S7-200 System Manual page 302

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.
10
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)