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Technical specifications for 6ES7241-1CH30-1XB0
Manufacturer:
Siemens
Part Number:
6ES7241-1CH30-1XB0
Product Family:
Siemens Simatic S7-1200
Product Type:
SIMATIC S7-1200 CB 1241 communication board
Stock:
1
Physical interface:
RS485
Connection:
Terminal block
Protocol mode:
Freeport serial communication
Maximum cable length:
1000 m under documented RS485 conditions
Backplane current:
50 mA
Power loss:
1.5 W
Protection class:
IP20
Weight:
0.031 kg
Estimated shipping dimensions:
3.8x6.2x2.1cm
Tariff Code:
85176200
Country of origin:
China
Place of shipment:
Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Bus wiring: Maintain A/B polarity and a common reference across all nodes.
Termination: Fit termination only at the two ends of the trunk.
Cable routing: Use suitable shielded twisted pair and keep it away from switching power conductors.
Frame format: Set baud rate, data bits, parity and stop bits to the partner-device values.
Addressing: Prevent duplicate node addresses where the application protocol uses them.
Timing: Allow for response delay, timeouts and direction control in the program sequence.
No communication: Check supply, polarity, common, termination and connector seating.
Corrupted frames: Review shielding, reflections, baud rate and frame-format settings.
Instrument links: Transfer data with serial meters, analyzers or controllers.
Drive interfaces: Connect supported RS485 drives using the required application protocol.
Legacy devices: Integrate equipment that exposes a documented RS485 serial interface.
Description
Serial instruments and drives can be integrated into a compact S7-1200 station through 6ES7241-1CH30-1XB0, a CPU-mounted CB 1241 board with one RS485 interface. Its Freeport function lets the PLC program exchange application-defined frames without adding a separate rack communication module.
Reliable communication through 6ES7241-1CH30-1XB0 depends on the electrical bus and the frame definition agreeing at the same time. A/B polarity, reference conductor, two-end termination and linear topology address the physical layer, while baud rate, parity, stop bits and timing govern the protocol exchange.
For intermittent links, 6ES7241-1CH30-1XB0 is best assessed from the trunk outward: first examine shared wiring and termination, then compare received frames and program timeouts at the affected node. This separates reflections or grounding problems from an error in the PLC communication sequence.
RS485 faults on 6ES7241-1CH30-1XB0 are often configuration or topology related. Record the entire bus layout and verify A/B polarity, reference conductor, two-end termination, cable shield, baud rate, parity, stop bits and node addressing before changing the board.
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FAQS
The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why does a partner device stay silent after 6ES7241-1CH30-1XB0 begins transmitting?
First confirm A/B polarity, common reference and two-end termination; then compare baud rate, parity, stop bits and node address. A valid outgoing frame with no reply points toward the bus or partner configuration.
How can corrupted frames on 6ES7241-1CH30-1XB0 be separated from a PLC parsing error?
Capture or count received characters before application parsing. Framing or checksum errors that change with cable routing or termination indicate the physical layer, while stable frames rejected by the program indicate protocol logic.
Where should termination be placed on an RS485 trunk using 6ES7241-1CH30-1XB0?
Terminate the two physical ends of the linear trunk. Extra termination, long stubs or star branches change the bus impedance and can make communication fail only at certain baud rates or node combinations.
Can 6ES7241-1CH30-1XB0 reliably serve an RS485 star network?
A linear daisy-chain is the appropriate topology for reliable RS485 operation. If existing wiring forms a star, use a suitable repeater or redesign the segments rather than treating each branch as an ordinary stub.
Why do 6ES7241-1CH30-1XB0 errors increase when nearby drives run?
Variable-frequency drive cabling can couple noise into the serial pair or reference conductor. Review separation, shield bonding, grounding and common-mode voltage, then compare error counts with the drives stopped and running.
How should transmit-to-receive timing be handled in a Freeport program for 6ES7241-1CH30-1XB0?
Allow the partner's response delay and the bus direction turnaround before declaring a timeout. The program should not start a new request while the previous response window is still active.
What indicates a reference-potential problem on a multi-vendor bus connected to 6ES7241-1CH30-1XB0?
Communication that changes when one node is disconnected, or repeated interface stress with correct A/B polarity, can indicate excessive common-mode voltage. Evaluate the reference conductor and isolation strategy for the complete bus.