Delta RMC151 - Manual (Page 1180)

RMC70/150 and RMCTools User Manual
In the 24V case, the maximum current is right at the maximum allowed by the SSRs. The
outputs may be overpowered if the coil resistance is reduced further. To calculate the
typical current through the SSR, we use the typical SSR resistance of 25Ω:
Typical current = 24V / (480Ω + 25Ω) = 47.5mA
Typical current = 12V / (480Ω + 25Ω) = 23.7mA
DI/O Module Inputs
The DI/O module inputs consist of a single common and eighteen individual input
connections and are compatible with signal levels ranging from 5V to 24V. Each input
draws a maximum of 10mA with a 24V input. Most P/C outputs can be connected to the
DI/O inputs directly. The exception is open collector (sinking) outputs. See the discussion
below for using open collector outputs.
Note:
The numbered inputs must be positive relative to the Input Cmn pin. That is, these are
sinking inputs.
The following are some input wiring diagrams:
Figure 4: Direct connection to Programmable Controller.
Figure 5: Direct connection to Programmable Controller.
Using DI/O Module Inputs with Open Collector Outputs
The DI/O module inputs can be used with open collector (sinking) outputs. There are two
configurations that can be used to drive the discrete inputs from an open-collector
output:
Figure 6: PNP Configuration: This configuration is the most popular for open collector
PNP outputs.
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