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PLC BL2500 User’s Manual
Hardware Reference
OEM Technology Solutions
Page 36
Figure 5: BL2500 Digital Inputs (Pull-up factory default)
The actual switching threshold between a zero and a one is between 0.9 V and 2.3 V for all 16 inputs, i.e.
V
INLMax
= 0.9 V and V
INHMin
= 2.3 V.
IN00-IN13 and IN15 are each fully protected over a range of -36 V to +36 V, and can handle short spikes
of ±40 V. IN14 is protected over a range of -36 V to +5 V.
4.2 DIGITAL OUTPUTS
The BL2500 has eight digital outputs, OUT0-OUT7, each of which can sink up to 200 mA. Figure 6 shows
a wiring diagram for using the digital outputs in a sinking configuration.
Figure 6: BL2500 Digital Outputs
+K is an externally supplied voltage of 3.3 - 40 V DC, and should be capable of delivering all the load
currents. Although a connection to a +K supply is not absolutely required with sinking outputs, it is highly
recommended to protect against current spikes when driving inductive loads such as relays and
solenoids.
Connect the poK supply to pin 1 of friction-lock connector terminal J10 and the negative side of the
supply to pin 2 of friction-lock connector terminal J10. A friction-lock connector is recommended to
connect this supply because the +K inputs are not protected against reverse polarity, and serious
damage to the BL2500 may result if you connect this supply backwards.
4.3 ANALOG INPUT
The A/D converter, shown in Figure 7, compares the DA0 voltage to AD0, the voltage presented to the
A/D converter. DA0 therefore cannot be used for the D/A converter when the A/D converter is being used.
"
Note:
Only DA1 is available for
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PLC as DA0 is used by the A/D converter.