Siemens Simatic S7-200 System Manual page 308

S7-200 Programmable Controller System Manual
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8. You can configure the Modem module to transfer data to another S7-200 CPU (if PPI protocol was
selected) or to transfer data to a Modbus device (if Modbus protocol was selected). Check the
Enable CPU data transfers checkbox and click the Configure CPU-to... button to define the data
transfers and the telephone numbers of the remote devices.
9. When setting up a CPU-to-CPU or a CPU-to-Modbus data transfer you must define the data to
transfer and the telephone number of the remote device. Select the Data Transfers tab on the
Configure Data Transfers screen and click the New Transfer button. A data transfer consists of a
data read from the remote device, a data write to the remote device, or both a read from and a write
to the remote device. If both a read and a write are selected, the read is performed first and then the
write.
Up to 100 words can be transferred in each read or write. Data transfers must be to or from the
V Memory in the local CPU. The wizard always describes the memory locations in the remote
device as if the remote device is an S7-200 CPU. If the remote device is a Modbus device, the
transfer is to or from holding registers in the Modbus device (address 04xxxx). The equivalent
Modbus address (xxxx) is determined as follows:
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– The Phone Number field is the telephone number of the messaging service provider. For text
messages this is the telephone number of the modem line the service provider uses to accept
text messages. For numeric paging this is the telephone number of the pager itself. The
Modem module allows the telephone number field to be a maximum of 40 characters. The
following characters are allowed in telephone numbers that the Modem module uses to dial
out:
0 to 9 allowed from a telephone keypad
A, B, C, D, *, # DTMF digits (tone dialing only)
, pause dialing for 2 seconds
! commands the modem to generate a hook flash
@ wait for 5 seconds of silence
W wait for a dial tone before continuing
( ) ignored (can be used to format the telephone number)
– The Specific Pager ID or Cell Phone Number field is where you enter the pager number or
cellular telephone number of the message recipient. This number should not contain any
characters except the digits 0 through 9. A maximum of 20 characters is allowed.
– The Password field is optional for TAP message. Some providers require a password but
normally this field should be left blank. The Modem module allows the password to be up to
15 characters.
– The Originating Phone Number field allows the Modem module to be identified in the SMS
message. This field is required by some service providers which use UCP commands. Some
service providers might require a minimum number of characters in this field. The Modem
module allows up to 15 characters.
– The Modem Standard field is provided for use in cases where the Modem module and the
service provider modem cannot negotiate the modem standard. The default is V.34
(33.6 kBaud).
– The Data Format fields allow you to adjust the data bits and parity used by the modem when
transmitting a message to a service provider. TAP normally used 7 data bits and even parity,
but some service providers use 8 data bits and no parity. UCP always uses 8 data bits with
no parity. Check with the service provider to determine which settings to use.
Modbus address = 1 + (V memory address / 2)
V memory address = (Modbus address – 1) * 2