6ES7321-1BH02-0AA0 Siemens Simatic S7-300 Digital Input Module

Product parameters

Module type: S7-300 SM 321 digital input module, 16-point input.

Input voltage: DC 24V (typical value), allowable range: DC 15V-30V.

Input current: Rated current of 7mA per point (at 24V).

Response time: Two modes can be selected through hardware Settings - standard mode (typical value 13ms) and fast mode (typical value 1.2ms).

Isolation method: Channel group isolation (8 points per group, electrically isolated from the backplane bus), isolation voltage 500V AC.

Input type: Supports NPN or PNP type sensors (pole-independent, compatible with both wiring methods).

Status indication: Each input point corresponds to one LED indicator light (green, on when the signal is connected).

Power supply requirement: No separate external power supply is needed. Power is drawn through the S7-300 backplane bus.

Environmental adaptability: Operating temperature 0°C-60°C, storage temperature -40 °C-70°C, protection grade IP20 (needs to be installed in a control cabinet).

Function

Digital signal acquisition: Convert the on/off status (0/1 signals) of external devices (such as limit switches, proximity sensors, buttons, etc.) into digital quantities recognizable by the PLC to achieve real-time monitoring of the status of on-site equipment.

Flexible response adjustment: Select the response speed through the hardware dip switch on the module. The standard mode is suitable for general scenarios, while the fast mode can be used in situations requiring high-speed signal detection (such as signal preprocessing before high-speed counting).

Isolation protection: The isolation design of the channel group can reduce the impact of external electrical interference on the PLC system, and at the same time protect the internal circuits of the module from high-voltage surges on site.

Intuitive status feedback: The LED indicator lights at each input point can quickly determine whether the on-site signal is normally connected, simplifying the debugging and troubleshooting process.

Application scenarios

Manufacturing production line: Collect the limit switch signals of the conveyor belt (to determine whether the workpiece is in place), the safety door switch status of the robotic arm (to ensure operational safety), the start and stop signals of the buttons, etc.

Equipment automation control: In machine tools, packaging machines, and printing equipment, the status of emergency stop buttons, limit switches, and photoelectric sensors is monitored as input conditions for equipment logic control.

Buildings and infrastructure: Door magnetic switches for monitoring access control systems, floor limit signals for elevators, pressure switch status in pump rooms, etc.

Auxiliary monitoring in process industry: In conjunction with liquid level switches, flow switches, etc., it collects upper/lower limit signals of liquid level in storage tanks and on-off signals of pipeline flow, assisting in the logical judgment of process control.

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