6ES7321-1CH20-0AA0 Siemens Simatic S7-300 Digital I/O Module

Product parameters

Input points: 16 digital input points, divided into 2 groups (8 points in each group).

Input voltage: DC 48V-125V (allowable range: DC 36V-140V), compatible with medium and high voltage DC control signals.

Input current: Approximately 6mA of rated current per point (at 125V).

Response time: Standard mode (typical value 10ms), delayed mode (typical value 100ms), which can be selected through hardware dip code to balance response speed and anti-interference performance.

Isolation method: Channel group isolation (8 points in each group are electrically isolated from the backplane bus), isolation voltage 2500V AC (1 minute), strong anti-interference ability.

Status indication: Each input point is equipped with a green LED indicator light, which lights up when the signal is connected, facilitating intuitive diagnosis.

Power supply: Power is drawn through the S7-300 backplane bus, without the need for an external independent power source.

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).

Installation features: No slot rule, the address is determined by the slot; Supports hot plugging in ET200M (requires active bus module).

Function

Medium and high voltage DC signal acquisition: Specifically designed for DC 48V-125V, it can be directly connected to external switch signals of this voltage level (such as limit switches, contactor contacts) without the need for additional voltage conversion components.

Strong isolation protection: The 2500V AC high isolation voltage effectively blocks external high-voltage interference, ensuring the stable operation of the PLC system. It is suitable for industrial sites with complex electromagnetic environments.

The response mode is adjustable: The delay mode (100ms) can filter out high-frequency noise and is suitable for signal acquisition near strong interference equipment such as motors and frequency converters.

Convenient debugging and maintenance: LED indicator lights provide real-time feedback on the signal status of each point, enabling quick location of wiring faults. Supports hot plugging to reduce downtime for maintenance.

Application scenarios

High-voltage control circuits in industrial equipment: Collect the limit switch and emergency stop button signals of heavy machinery controlled by DC 48V-125V.

Process control auxiliary monitoring: In the fields of chemical engineering and energy, the status signals from medium-voltage DC sensors are connected as control logic inputs.

Outdoor or harsh environment equipment: Suitable for signal acquisition of outdoor sensors that require high DC voltage drive, with anti-interference performance suitable for complex environments.

Distributed control system: In conjunction with the ET200M distributed I/O system, it collects medium and high-voltage DC signals at remote sites, supports hot-swapping, and enhances the flexibility of system maintenance.

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