Delta RMC101 Uživatelský manuál stáhnout pdf (Strana 253)

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101

Digital I/O 5.1

Communications 5-3

Figure #2: SSR switching resistive load; low-side configuration

To calculate the maximum current through the SSR in the above diagram, we assume zero SSR

resistance:

Max. current = 24V / 470W = 51.1mA

Max. current = 5V / 470W = 10.6mA

Notice that both maximum current are well within the ratings. To calculate the typical current

through the SSR, we use the typical SSR resistance of 25W:

Typical current = 24V / (470W + 25W) = 48.5mA

Typical current = 5V / (470W + 25W) = 10.1mA

Digital Inputs

The Digital Inputs are compatible with signal levels ranging from 5V to 24V. The Digital inputs

draw 6mA maximum with a 5V input and 10mA with a 24V input.

5.1.2.3 CPU Inputs

Each of the CPU’s two inputs have both a + and - connection. This allows the input to be connected

as either a sinking or sourcing input, which means that most P/C outputs can be connected directly to

the CPU inputs. See the wiring diagrams below.

5.1.2.4 DI/O Inputs

The DI/O inputs consist of a single common and eighteen individual input connections.

Note: The numbered inputs must be positive relative to the ”r;Input Cmn” pin common. That is, these

are sinking inputs.

Most P/C outputs can be connected to the DI/O inputs directly. The exception is open collector

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