User`s manual
PK2100
3-12 s I/O Configurations
The relay output signals are routed through the U35 high-current driver
chip.
Digital Outputs
The PK2100 has 10 digital outputs (O1O10). Seven of the outputs
belong to one high-current driver chip (U26) and three belong to another
chip (U35). These outputs can drive inductive loads such as relays, small
solenoids, and stepping motors.
Outputs O1O7 on U26 use a common bus (K) for the protective
diodes. Thus, it is possible to use a power supply for these outputs other
than the power supply for the PK2100. All loads connected to the same
group of drivers must use the same power supply so the diodes can return
inductive spikes to the same power supply. Refer to Figure 3-11.
Inductive
load
Digital output
channel,
O1
O7
K
External
power supply
(up to 48 V)
Figure 3-11. Routing External Power Supply
for PK2100 Digital Outputs
If the PK2100s power supply (DC in, 12 or 24 volts) is used, route K to
the power supply by connecting jumper H11. Refer to Figure 3-12.
Inductive
load
Digital output
channel,
O1
O7
K
H11
DC in DC in
Figure 3-12. Routing PK2100 Internal Power Supply
for Digital Outputs