Measurement Computing PointScan 300 Series rev.1.0 - Manual (Page 23)

PointScan/300 User’s Manual 9-12-01 Discrete Output Modules 5-1
Discrete Output Modules 5
This section documents the following modules:
PointScan/336 PointScan/337 PointScan/339
PointScan/340 PointScan/341
8 Channel Output Modules
PointScan/300 Series eight channel discrete output modules incorporate one of two module base styles.
These base styles and other features are detailed below.
Standard Base
With the standard base, one terminal from each channel is connected to an internal common bus. A single
user power connection to the module allows up to eight output devices to be connected in sourcing or
sinking configurations using two wires apiece. This is the most common wiring configuration. Refer to the
next page for sample wiring connections.
(Optional) Universal Wiring Base (-w)
With the (optional) Universal Wiring base, each discrete output has two independent screw terminals to
provide point to point isolation. Sample wiring is shown on the next page.
Output Isolation
All discrete outputs are optically isolated from the PointScan/300 Series circuitry, regardless of the module
base style. If the (optional) Universal base is used, the discrete outputs will be channel to channel isolated
as well.
Watchdog Output Feature
The first DC output channel may be configured (in software) as a watchdog output. If this feature is
selected, the output will be on when there is good command activity from the gateway. The output will no
longer be controlled as a discrete output. The corresponding register will be unused.