IB-106-340
3-4
3-2.
LOGIC I/O. This two-terminal logic contact can be
configured either as a solid-state relay-activated
alarm or as a bi-directional calibration handshake
signal to an IMPS 4000 or SPS 4000. The config-
uration of this signal depends on the setting of the
LOGIC I/O PIN MODE via HART/AMS. The ten
different modes available are explained in Table 3-1.
a.
Alarm. When configured as an alarm, this signal
alerts you to an out-of-spec condition. The output
is 5 V in series with a 340 ohm resistor. For op-
timum performance, Rosemount recommends
connecting the output to a Potter & Bromfield
3.2 mA DC relay (P/N R10S-E1Y1-J1.0K).
Of the ten modes in Table 3-1, modes 0 through
7 are the alarm modes. The factory default is
mode 5 for Oxymitter 4000 units without an
IMPS 4000 or SPS 4000. In this mode, the output
will signal when a unit alarm or a CALIBRA-
TION RECOMMENDED indication occurs.
b.
Calibration Handshake Signal. If using an
optional IMPS 4000 or SPS 4000, the logic I/O
must be configured for calibration handshaking.
Of the ten modes in Table 3-1, only modes 8 and
9 are configured for calibration handshaking. For
an Oxymitter 4000 with an IMPS 4000 or an SPS
4000, the factory sets the default to mode 8. In
this mode, the logic I/O will be used to commu-
nicate between the Oxymitter 4000 and se-
quencer and to signal the sequencer when a
CALIBRATION RECOMMENDATION indica-
tion occurs.
Table 3-1. Logic I/O Configuration.
Mode
Configuration
0
The unit is not configured for any alarm condition.
1
The unit is configured for a Unit Alarm.
2
The unit is configured for Low O
2
.
3
The unit is configured for both a Unit Alarm and Low O
2
.
4
The unit is configured for a High AC Impedance/CALIBRATION RECOM-
MENDED.
5*
The unit is configured for both a Unit Alarm and a High AC Imped-
ance/CALIBRATION RECOMMENDED.
6
The unit is configured for both a Low O
2
and High AC Imped-
ance/CALIBRATION RECOMMENDED.
7
The unit is configured for a Unit Alarm, a Low O
2
, and a High AC Imped-
ance/CALIBRATION RECOMMENDED.
8**
The unit is configured for a calibration handshake with IMPS 4000 or SPS
4000. CALIBRATION RECOMMENDED will initiate the calibration cycle.
9
The unit is configured for a calibration handshake. CALIBRATION
RECOMMENDED will not initiate the calibration cycle with the IMPS 4000
or SPS 4000.
*The default condition for an Oxymitter 4000 without an IMPS 4000 or SPS 4000.
**The default condition for an Oxymitter 4000 with an IMPS 4000 or SPS 4000.
Summary of Contents for Oxymitter 4000
Page 19: ...IB 106 340 xv ...
