BRAINS
SNAP
ANALOG AND DIGITAL
DATA
SHEET
Form 787-000718
page 17/19
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If you configure a digital module on the digital address
base + 0 at the first module location, that will preclude you
from configuring an analog module on analog address base +
2 at the first module location, as analog channels 0 and 1 of
analog address base + 2 overlap with digital channels 0,1,2,
and 3 of digital address base + 0. This fact will be indicated in
OptoControl by text in the Configure I/O Points dialog, which
will display information in the Name field for analog channels
0 and 1 stating that those channels are used by a SNAP digital
module, and will specify the name of that I/O unit address.
Digital
When configuring the unit, select B3000 Snap Digital as
the Type in the Add I/O Unit dialog.
The digital addresses are base+0 and base+1. If the SNAP
brain is configured at address 12 (base), the digital addresses
would be 12 and 13 .
When a point is configured, OptoControl automatically
creates and configures the other three points in the module.
For example, if a digital SNAP point is added at channel 5,
then identical points are created at channels 4, 6, and 7.
Unique names are created for these new points, based on the
name entered for the original point. You can then modify
the name, as well as the description, features, default, and
watchdog for each channel independently. If the module type
of one digital point is changed, then the module type of all
other points in that module are automatically changed.
OptoControl B3000 SNAP I/O Configuration
Analog
When configuring the unit, select B3000 SNAP Analog as the
Type in the Add I/O Unit dialog.
The analog addresses are base+2 and base+3. If the SNAP
brain is configured at address 12 (base), the analog addresses would
be 14 and 15.
Inputs
:
When an input is configured, OptoControl automatically creates
and configures the other input channel on that module. The name
of the other channel can then be modified, as well as the description,
default, and watchdog fields. The module type and scaling cannot
be modified.
Outputs:
Single-channel analog output modules use two analog channels,
but they contain only one channel of output. Only the even-numbered
channel is usable, e.g., 0, 2, 4, etc. The odd-numbered channel is
not valid. Opto 22 also produces 2-channel analog output modules.
Other Notes
Event/reactions and PID Loops can only operate on points in
the same address group. They behave just like standard I/O in this
sense, and cannot cross address boundaries. For example, a PID
loop cannot use an input on Address Base + 2, to control an output
on Base + 3.
Up to 127 event/reactions can be configured per SNAP address.