Instruction manual

Instruction Manual
760006-A
September 2001
Rosemount Analytical Inc. A Division of Emerson Process Management Appendices 11-1
Model NGA 2000 Platform
SECTION 11
APPENDICES
These appendices describe modules no
longer supported in software version 3.6.
These modules are supported in software
version 2.4 and are included here for users of
the older versions of the Platform.
11-1 SMART I/O MODULES
a. Analog I/O Module
Overview
Refer to Section 2.6 for instructions on
how to install the Basic Analog I/O Mod-
ule and Section 2.9 on how to bind the
Basic Analog I/O Module.
Software V2.0, V2.1 and V2.2 Analog I/O
Modules provide an analog output signal,
up to three alarm contacts, four contacts
that are used to indicate the current range
of operation of its associated Analyzer,
and six digital inputs, of which four are
used to determine which range to use.
V2.3 and later allow the user to configure
all of the relay outputs and digital inputs to
whatever functionality is desired.
In V2.3, special software allows the I/O
module to track the special functions sup-
ported by the Analyzer, and to show on its
control screens whatever the Analyzer
can provide or accept in the way of digital
indication or control. Any of the relay out-
puts or digital inputs can be assigned to
any function that the Analyzer can sup-
port.
NOTE
V2.2 Platform software only supports
V2.2 I/O Modules. V2.3 Platform soft-
ware supports both V2.2 and 2.3 I/O
Module software, but only V2.3 I/O
Module software has the special fea-
tures mentioned here.
The analog output signal is bound to the
Analyzer’s PVA variable, i.e. its main out-
put reading. The analog output is scaled
to the current operating range (or to a
specific operating range if desired). It may
be connected as either a voltage output
(0-5V) or as a current output (0 or 4 -
20mA). In any case both the zero and
span are live, which is to say that the out-
put can go below the zero point or above
the fullscale point.
There are three SPDT relay outputs which
can be used as alarms. SPDT refers to a
type of relay which allows connection to
the Common (C), Normally Open (NO)
and Normally Closed (NC) contacts.
These designations refer to the state of
the contacts when the relay is un-
powered.
In V2.2 and earlier, four more SPST relay
outputs are used to indicate the active
range of the I/O module. This is normally
the same as the range used by the Ana-
lyzer, unless the user has chosen to op-
erate the I/O module on a constant range.
Only one of these relays will be energized
at one time. These relays may retain this
function in V2.3, or they can be re-
assigned to other functions.
There are also digital inputs that may be
used to control which range the I/O mod-
ule or Analyzer is on. In V2.3 they may be
made to control any specific functionality
supported by the bound Analyzer, such as
to light the flame in the case of the FID.
NOTE
Use the path Analyzer and I/O Expert
Controls & Setup..., System & Network
I/O Module Setup…, Systems SIO
Module… to access the I/O module
setup menus.