Instruction manual

ControlWave Micro Instruction Manual (CI-ControlWave Micro)
Revised Jun-2013 Installation 2-11
Figure 2-10. PSSM Module with Mode Switch, Display Interface, and without Watchdog Connector
Two terminal blocks (see Figure 2-9) provide external input power and
watchdog connector switch connections. Two red LEDs on the PSSM’s
front panel enable you to monitor the status of the watchdog (WD) and
Idle (IDLE) circuits.
Note: The Idle LED is usually on, indicating when the CPU has free
time at the end of its execution cycle. If the LED is off, it
indicates the CPU has no free time and may be overloading.
Six additional LEDs provide system status codes (see Chapter 5).
PSSMs contain a DC-to-DC converter that generates a +3.3 Vdc supply
for the entire unit (that is, the CPU and various I/O modules that plug
into the backplane).
Power
Supply
An auxiliary +5 Vdc regulator powers low power detection circuitry
and sequencer timing circuitry.
The power supply operates from +10.7 to +30 Vdc or from +21.7 to +30
Vdc. You can configure the nominal input supply configuration (12V or
24V) using configuration jumper switches on the PSSM PCB. See
Figure 2-9 and Figure 2-10.