maxPAC Input/Output Subsystem
Metso Automation MAX Controls Inc. • 277596 •
1-17
Specifications
Environment
The Model IOP I/O operates in the temperature range of 0°C to 60°C at a
relative humidity range of 0 to 90%, noncondensing.
I/O Bus
The Model IOP I/O uses an 8-bit parallel asynchronous I/O bus, capable of
10 microsecond transfers. The I/O bus interface uses LSI circuitry for better
reliability. Parity checks are performed on all inputs and outputs, with
additional security provided for outputs using a check-before-execute control
strategy.
To further enhance reliability, I/O incorporates module address verification
and multiple module detection checks. Bus fault detection is also performed
by automatic confirmation of input data on every module.
Inputs/Outputs
All modules, both analog and digital types, withstand the normal or common
mode connection (IEEE-472, ANSI c37.90) and still maintain correct
operation. Common mode transients are bypassed to chassis metal work. All
points are optically or transformer isolated from the maxDNA I/O bus.
Channel to channel isolation allows series or parallel connection between
channels or external relay systems. All digital modules have logic state
indication on the front panel, one indication per point.
In addition to logic state indication, digital output modules contain fused
outputs and a front-panel blown fuse indicator. Each output also has a
deadman timer (approximately 1 second) that can be optionally used to
freeze or drop out all outputs if the module is not updated by the DPU.
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