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As shown in the table below, the maximum length of a network segment is determined by two factors: isolation (using an RS-485 repeater) and baud rate.
Isolation is required when you connect devices at different potentials. Different reference potentials can exist when grounds are physically separated by a long distance. Even over short distances, load currents of heavy machinery can cause a difference in ground potential.

** The maximum distance allowed without using an isolator or repeater is 50 m. You measure this distance from the first node to the last node in the segment.

S7-200 networks use the RS-485 standard on twisted pair cables. The following table lists the specifications for the network cable. You can connect up to 32 devices on a network segment.

Connector Pin Assignments

The communication ports on the S7-200 CPUs are RS-485 compatible on a nine-pin subminiature D connector in accordance with the PROFIBUS standard as defined in the European Standard EN 50170. The table below shows the connector that provides the physical connection for the communication port and describes the communication port pin assignments.

	Pin Number	Signal	Port 0/Port 1
	1	Shield	Chassis ground
	2	24V Return	Logic common
	3	RS-485 Signal B	RS-485 Signal B
	4	Request-to-send	RTS(TTL)
	5	5V Return	Logic common
	6	+5V	+5V, 100W series resistor
	7	+24V	+24V
	8	RS-485 Signal A	RS-485 Signal A
	9	Not applicable	10-bit protocol select (input)
	Connector shell	Shield	Chassis ground

You can find all the old S5 technical documentation in one place in the official Siemens S5-S7 Migration web site.
Follow the link below and find out what you need under the appropriate links.

Web link: http://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=27229639&caller=view

Converting Data Blocks to Excel Format. Our program can convert datablocks to excel format. Except, Struct of Array and UDT types, all data types are formatted. You can download our program and use it.

Supported Data Types:

You can download Datablock Excel Converting program db2XL from here.

You Can find S7-200 System Manual from Siemens Site. The link is given below;

System Manual

Part number of the documentation: 6ES7298-8FA24-8BH0

Document identification number: A5E00307987-04

You Can find S7-200 System Manual from Siemens Site. The link is given below;
System Manual

Part number of the documentation: 6ES7298-8FA24-8BH0
Document identification number: A5E00307987-04
http://support.automation.siemens.com/WW/llisapi.dll/1109582?func=ll&objId=1109582&objAction=csView&nodeid0=10805149&lang=en&siteid=cseus&aktprim=0&extranet=standard&viewreg=WW&load=content&subtype=133300

Copyright© 2009 – Nokta Industrial. All rights reserved.
Tel: 0090-212-272-5880
Fax: 0090-212-272-5868
Copyright© 2009 – Nokta Industrial. All rights reserved.

Tel: 0090-212-272-5880

Fax: 0090-212-272-5868

You Can find S7-200 SIMATIC Text Display (TD) User Manual from Siemens Site. The link is given below;
System Manual

Document identification number: A5E00765548-02

http://support.automation.siemens.com/WW/llisapi.dll/1087140?func=ll&objId=1087140&objAction=csView&nodeid0=10805149&lang=en&siteid=cseus&aktprim=0&extranet=standard&viewreg=WW&load=content&subtype=133300

The diagrams below show various wiring options. These examples apply to all channels (channel 0 to 7).

Wiring: 2 and 4-wire connection for voltage output

The following image depicts:

• 2-wire connection, no compensation for line impedance and
• 4-wire connection with compensation for line impedance

Click here for diagram.

Figure: Wiring and block diagrams

1. DAC
2. Internal supply
3. Equipotential bonding
4. Functional earth
5. Backplane bus interface
6. Electrical isolation

Wiring: Current output

Click here for diagram.

Figure: Wiring and block diagrams

1. DAC
2. Internal supply
3. Equipotential bonding
4. Functional earth
5. Backplane bus interface
6. Electrical isolation

The diagrams below show various wiring options.

Wiring: Voltage and current measurement

Wire the voltage inputs of the channel voltage in parallel using the corresponding shunt resistor when measuring current. Bridge the channel input terminals with the adjacent connector terminals.
Example: You configure channel 0 for current measurement by bridging terminals 22 and 2, and terminals 23 to 3.
At the channel configured for current measurements, connect the shunt resistor to the adjacent channel terminals in order to achieve the specified precision.

Figure: Wiring and block diagrams

1. Voltage measurement
2. Backplane bus interface
3. Electrical isolation
4. Analog to Digital Converter (ADC)
5. Equipotential bonding

Wiring: 2-wire and 4-wire transducer

Figure: Wiring and block diagrams

1. Backplane bus interface
2. Electrical isolation
3. Analog to Digital Converter (ADC)
4. Channel 0 for 4-wire transducer
5. Channel 7 for 2-wire transducer (with external supply)
6. Equipotential bonding

1. Channel number
2. Status display – green
3. Backplane bus interface

Instructions:
It is not possible for users to format an MMC. All you can do is “reset" an MMC, which deletes all user data. Proceed as follows.

1. The MMC is slotted in the bay of the CPU. Your CPU requests an overall reset (slow blinking of the STOP LED).
2. Set the switch to MRES and hold it there (approx. 9 seconds) until the STOP LED lights continuously.
3. Within the next 3 seconds you must let the switch go and set it again to MRES. The STOP LED now blinks during the delete procedure.

If the MMC continues to request an overall reset after the procedure described above, then it is defective.

Note:
It is only possible to reset the MMC if it contains data that is invalid for the CPU. Otherwise the MMC is only initialized by the procedure described.

Warning:Do not use the MMC for non-SIMATIC purposes and do not format it with a third-party device. This would possibly overwrite the internal structure of the MMC that cannot be restored. In this case the MMC is no longer recognized/accepted in a SIMATIC CPU and can no longer be used with SIMATIC devices.

Official printer list for Simatic HMI panels and the print settings for these panels.

You can find here (Siemens Excel file).

Offizielle_Druckerliste_220208_e.xls

The following system limits apply to Windows-based systems:

^*) Note for CE devices (xP 270, xP 277, MP 370, Mobile Panel 277): The operator panels are primarily not designed for logging data cyclically, they are more intended for logging acyclic error states (e.g. fault alarms and process signals). Operator panels are not designed for extensive logging tasks with large volumes of data or with high performance requirements.

Info, tips and examples of logging

Info:
Maximum write access to CF /MMC/SD cards and USB sticks.
Please note that CF/MMC/SD cards and USB sticks currently only allow a maximum guarantee of 100,000 write accesses (for CF cards) to 1,000,000 (for USB sticks). The specified maximum number of write accesses might vary from manufacturer to manufacturer and change in the course of time.

Show Error

With the “Report System Error" function STEP 7 provides a convenient option for displaying diagnostics information in the form of messages. STEP 7 automatically generates the blocks and message texts required for this. All users have to do is load the blocks generated into the CPU and transfer the messages into the WinCC project.

Requirements:You must fulfill the following requirements to be able to use the “Report System Error" function:

• The WinCC project is integrated in the STEP 7 project.
• At least STEP 7 V5.1 is required.
• At least WinCC V5.1 is required.
• The WinCC component “AS-OS Engineering" is installed.

Click here for further information.

Download the ZIP file. UNZIP the package and install required file (Install GSD File). Then CPU will be installed on Hardware Catalog as Slave (Add. Field Devices). Add the CPU as Slave and then define some Inputs/Outputs.

GSD Files: Simatic.zip

Maximum segment/cable lengths for Profibus Networks is listed below.

Your question will be sent to us by e-mail. This not a technical support site.