Siemens SIMATIC S7-300 Digital Input Module (6ES7321-1BH02-0AA0)

Siemens SIMATIC S7-300 Digital Input Module (6ES7321-1BH02-0AA0)

Power supply and power consumption parameters

Load voltage (L+): The rated value is 24V DC, with an allowable range of 20.4V DC (lower limit) to 28.8V DC (upper limit), meeting the common DC power supply requirements in industrial scenarios.

Backplane bus current: Powered from the 5V DC backplane bus, with a maximum current of 10mA, it has little impact on the bus power supply load.

Power loss: Typical value of 3.5W, low power consumption, conducive to overall heat dissipation and energy consumption control of the system.

Digital input performance

Basic configuration: There are a total of 16 digital inputs, and the input characteristics comply with Type 1 of IEC 61131 standard. It supports 2-wire sensor connection (maximum static current of the sensor is 1.5mA).

Input voltage and current: rated input voltage 24V DC, signal "0" corresponds to a voltage range of -30V to+5V, signal "1" corresponds to 13V to 30V; signal "1" has a typical input current of 7mA to ensure signal recognition stability.

Simultaneously controllable input quantity: Whether installed horizontally (temperature ≤ 40 ° C or ≤ 60 ° C) or vertically (temperature ≤ 40 ° C), the maximum number of simultaneously controllable inputs is 16, with no performance degradation under scene limitations.

Input delay: Non parametric delay, the delay range from "0" to "1" (signal on) and "1" to "0" (signal off) is consistent, with a minimum of 1.2ms and a maximum of 4.8ms, suitable for industrial control scenarios that do not require extreme response speed.

Cable support: Shielded cables can support up to 1000m, unshielded cables can support up to 600m, suitable for long-distance signal transmission needs and reducing wiring restrictions.

Interruption and diagnostic function

The module does not have additional alarm and diagnostic functions, specifically manifested as:

No diagnostic alarm or hardware interrupt function, unable to actively report faults or trigger emergency interrupts.

Only equipped with a green digital input status indicator light, which can visually observe whether the input signal is normal, without other diagnostic indicator components.

Isolation and Connection Design

Potential isolation: 16 inputs are divided into one group, and there is no isolation between channels within the group. However, all channels are isolated from the backplane bus through optocouplers to enhance anti-interference ability and protect the safety of the backplane bus.

Insulation test: 500V DC is used for insulation testing, which complies with industrial equipment insulation standards.

Connection method: It needs to be equipped with a 20 pin front connector, with uniform interface specifications for easy installation and replacement.

Physical specifications

Dimensions: Width 40mm, height 125mm, depth 120mm, compact size, suitable for dense layout inside control cabinets.

Weight: Approximately 200g, relatively light in weight, with low load-bearing requirements for the installation structure.