PROFIBUS DP to serial RS-232C bridge
The Siemens 6ES7158-0AA01-0XA0 is a SIMATIC DP distributed I/O module that converts between a PROFIBUS DP network and a standard RS-232C serial interface, letting a legacy serial device talk to a PROFIBUS master without a custom gateway. It runs on 24 VDC, drawing up to 300 mA, and handles PROFIBUS at up to 12 Mbit/s — fast enough for most distributed I/O applications without bottlenecking the bus cycle.
Serial protocol and physical layer
The RS-232C side uses a 9-pin sub-D socket (female) and supports configurable parity — none, even, or uneven — plus 8 data bits with 1 stop-bit, covering the common asynchronous serial formats a PLC or serial printer expects. When using the 3964(R) protocol, the maximum transmission rate drops to 19.2 kbit/s, which is the protocol overhead limit, not the hardware ceiling. The module also carries an RS-232C (V.24) interface type, so it mates directly with standard PC COM ports or serial terminals without level shifters.
Environmental and panel fit
Rated IP20, so it belongs inside a clean, dry control cabinet — not on a washdown line or outdoors. At about 300 g, it won't stress the DIN rail clip or sag in high-vibration panels.
No official successor or pin-compatible alternative is listed; the 6ES7158-0AA01-0XA0 is the active SKU for bridging PROFIBUS DP to RS-232C in the SIMATIC DP family.