Siemens Simatic S7 Series User Manual

65
Specialized Expansion Modules
In addition to the expansion modules previously discussed
that provide additional discrete or analog I/O, several expansion
modules are available to provide communication interfaces or
specialized I/O functions.
EM 241 Modem Module One of these modules is the
EM 241 Modem module. This
module supports communication between a computer with
STEP 7 Micro/WIN and an S7-200 PLC.
SF/DIAG
EM 241
MODEM
241-1AA22-0XA0
Modem
Computer
S7-200 PLC with
EM 241 Modem Module
The EM 241 provides an international telephone line interface
and supports sending numeric and text paging messages, as
well as SMS (Short Message Service) messages to cellular
phones. This is useful for remote diagnostics and maintenance,
machine control, alarm systems, and general communication
functions.
In addition to CPU-to-CPU communication via a telephone line,
the EM 241 also supports Modbus RTU protocol, a protocol
that has been widely used for many years.
SINAUT MD 720-3 SINAUT Telecontrol (Siemens Network Automation) permits
GSM/GPRS Modem Module networking of individual controls and control systems over a
WAN (Wide Area Network).
One approach for providing this capability is
SINAUT Micro.
This is a simple and flexible way to link stationary or mobile
stations to a master control center. SINAUT Micro is appropriate
where smaller amounts of data have to be transmitted to
permit monitoring and control of remote stations using wireless
techniques with the General Packet Radio Service (GPRS) of the
Global System for Mobile Communication (GSM) mobile radio
network.
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Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.