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Wiring the DPU
terminator can be plugged directly into the adapter out of the way of
interference with the DPU.
The DPU is designed to allow installation and removal with the +24 V dc
power supply turned on.
Mounting Procedures
Before mounting any hardware, refer to the cabling and field wiring sections
of Publication 277563, Model IOP Input/Output System Installation and Pre-
paration, for information also pertinent to mounting.
To install the DPU in the rack, refer to Chapter 6.
With the exception of the 10 point terminal block on the front panel of the
DPU chassis, no hard wiring is required. All connections between the DPU
module and the DPU chassis are made upon installation into the I/O rack.
Use maxTOOLS to create input designations for each DPU during
configuration.
Ten terminal board connectors, with #6 screws, are positioned at the lower
left side of the DPU chassis. Pin-outs are as follows:
Table 1-1. Ten Point Terminal Block
PIN No.
Purpose
1-6
Reserved
7
Open
8, 9
DPU offline contact (photovoltaic relay, opens when the DPU is
offline)
Peak operating voltage = ±300V
Maximum load = 60 mA
On resistance = 30 Ohms
Off resistance = 1 mOhms (Contact is closed if DPU is online)
10
Circuit Ground
Metso Automation MAX Controls • • • • 277573 • • • •
Introduction
1-3
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