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SIEMENS | SIMATIC S7-1200
6GK7243-5DX30-0XE0
CM 1243-5 PROFIBUS DP Master
PROFIBUS DP-V1 master | 9-pin D-sub RS485 | 9.6 kbit/s to 12 Mbit/s
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Siemens 6GK7243-5DX30-0XE0
The 6GK7243-5DX30-0XE0 is a SIMATIC S7-1200 CM 1243-5 communications module that operates as a PROFIBUS DP master. It supports cyclic DP communication, acyclic DP-V1 services, S7 communication and PG/OP communication through a 9-pin D-sub RS485 interface.
Core value: integrated PROFIBUS DP master connectivity for SIMATIC S7-1200 with cyclic, acyclic and engineering communication.
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OFFICIAL SPECIFICATIONS | 6GK7243-5DX30-0XE0
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Complete model
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6GK7243-5DX30-0XE0
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Product family
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SIMATIC S7-1200
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Product type
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CM 1243-5 PROFIBUS DP master communications module
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Dimensions
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30 x 100 x 75 mm (W x H x D)
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Weight
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134 g net; 171 g packaged
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Communication interface
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PROFIBUS DP, RS485
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Transmission standard
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PROFIBUS DP-V1
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Connector
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9-pin D-sub female
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Transmission rate
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9.6 kbit/s to 12 Mbit/s
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PROFIBUS address range
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2 to 125 in operational use
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Maximum DP slaves
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32 per master with supported V3 or later CPU
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Rated supply voltage
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24 V DC external supply
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Supply voltage range
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19.2 to 28.8 V DC
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Typical current consumption
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100 mA
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Power dissipation
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2.4 W
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Interface supply
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15 mA at 5 V for bus termination
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Electrical isolation
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710 V DC for 1 minute
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Installation position
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Left of the SIMATIC S7-1200 CPU
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Mounting
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35 mm DIN rail
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Conductor cross-section
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0.14 to 1.5 mm2
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Terminal tightening torque
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0.45 N-m
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Operating temperature
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0 to +55 C with horizontal DIN rail; 0 to +45 C with vertical DIN rail
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Storage and transport temperature
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-40 to +70 C
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Relative humidity
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Up to 95%, non-condensing
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Protection and functions
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IP20; cyclic DP, acyclic DP-V1, PUT/GET S7 communication and PG/OP communication
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CONTACT
STELLA
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PROFIBUS master
Controls compatible PROFIBUS DP slaves from an S7-1200 automation station.
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Cyclic data exchange
Transfers deterministic process input and output data through DP cyclic communication.
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Acyclic services
Supports DP-V1 record and alarm services through the documented program instructions.
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Engineering access
Provides S7 communication plus PG and OP communication over the PROFIBUS network.
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External supply
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24 V DC, 19.2 to 28.8 V range
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Typical current
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100 mA
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Power dissipation
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2.4 W
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Interface
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RS485 PROFIBUS DP-V1
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Connector
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9-pin D-sub female
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Transmission rate
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9.6 kbit/s to 12 Mbit/s
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Termination supply
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15 mA at 5 V
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Electrical isolation
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710 V DC for 1 minute
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Terminal wiring
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0.14 to 1.5 mm2 conductor; 0.45 N-m tightening torque
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1 | Position the communications module
Mount the CM 1243-5 to the left of the SIMATIC S7-1200 CPU on a 35 mm DIN rail.
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2 | Connect the external supply
Provide 24 V DC within 19.2 to 28.8 V and account for approximately 100 mA module current.
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3 | Build the PROFIBUS segment
Use the 9-pin D-sub RS485 interface, approved PROFIBUS cable, correct shielding and termination, and a unique address from 2 to 125.
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4 | Configure and commission
Configure the DP master and slave data in the engineering project, then verify cyclic data, acyclic services and diagnostics before operation.
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Enclosure protection
IP20; mount inside a suitable electrical enclosure.
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Temperature limits
0 to +55 C with horizontal DIN rail or 0 to +45 C with vertical DIN rail.
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Isolation
PROFIBUS interface isolation verified by a 710 V DC, one-minute test.
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Storage environment
-40 to +70 C and up to 95% relative humidity without condensation.
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Install the module in an enclosure, use approved PROFIBUS wiring and termination, and follow the documented mounting-orientation temperature limit and S7-1200 CPU compatibility requirements.
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Q1. How can a buyer verify the exact 6GK7243-5DX30-0XE0?
A. Match the complete Siemens MLFB on the module and packaging. The 5DX30 code identifies the CM 1243-5 PROFIBUS DP master, not a DP slave, Ethernet communications processor or another S7-1200 communications module.
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Q2. How can New, Used and Refurbished condition be distinguished?
A. Request current photos of the front label, side MLFB and serial labels, 9-pin D-sub port, power terminals, DIN-rail latch and packaging. A new unit should show no connector wear, terminal marks, rail-latch damage, dust or replacement labels.
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Q3. How should procurement verify the supplier?
A. Check the legal entity, registration, verifiable address, company-domain correspondence, bank-beneficiary consistency and traceability for 6GK7243-5DX30-0XE0 before payment.
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Q4. Which technical points should an engineer confirm?
A. Confirm PROFIBUS DP-master function, DP-V1 requirement, 9-pin RS485 interface, 9.6 kbit/s to 12 Mbit/s rate, supported CPU version, 32-slave limit, 24 V DC supply, 30 x 100 x 75 mm size and 134 g net weight.
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Q5. What physical evidence should be requested before payment?
A. Ask for dated photos or video showing the full MLFB, serial and hardware markings, D-sub pins, terminal condition, packaging labels and dimensions. If testing is offered, request a serial-numbered power-up and PROFIBUS diagnostic demonstration.
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Q6. Can a similar 6GK7243 suffix replace this CM 1243-5?
A. Not automatically. Other communications modules may use a different protocol, master/slave role, connector, firmware requirement or program interface. Replacement requires confirmation of CPU compatibility, PROFIBUS role and engineering configuration.
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