maxPAC Hardware Reference Guide
Metso Automation MAX Controls Inc.
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277596
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8-2
panel, is on when system power is present and the module is communicating
with the DPU. This LED blinks on and off when the module is not being
scanned by the DPU.
Bus Address
This module requires one I/O one bus address. The address range for digital
input modules is 0 – 1F (0-31)
Jumper Configuration
For IOP332 and IOP333, jumpers (W1—W16) must be installed for AC
inputs.
Note
: IOP334 does not include jumpers.
Module Operation
The following is a simplified sketch of the circuit for one channel. The
signal-conditioning block provides filtering, current limiting circuit, and an
input threshold. It also includes the LED. The optical isolator provides
isolation between the field circuits and the logic circuits. The input status is
buffered and latched in the I/O bus interface circuit. The data is presented to
the I/O bus as a 16-bit word when the module is scanned by the DPU. A
watchdog timer in the interface circuit controls the operation of the active
LED, causing it to blink when the module is not scanned for 0.7 seconds.
Signal
Conditioning
Circuit
I/O BUS
Interface
Circuit
Input Voltage
