Emerson Process Management IB106-340 Logic I/O, Alarm, Calibration Handshake Signal

Instruction Manual

IB-106-340 Rev. 2.4 April, 2001

Oxymitter 4000

3-2 LOGIC I/O

This two-terminal logic contact can be config- ured either as a solid-state relay-activated alarm or as a bi-directional calibration handshake sig- nal to an IMPS 4000 or SPS 4000. The configu- ration 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 re- sistor. For optimum performance, Rose- mount 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 CALIBRATION RECOM- MENDED 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 con- figured 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 communicate between the Oxymit- ter 4000 and sequencer and to signal the sequencer when a CALIBRATION REC- OMMENDATION indication 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 O2.
3	The unit is configured for both a Unit Alarm and Low O2.
4	The unit is configured for a High AC Impedance/CALIBRATION RECOMMENDED.
5*	The unit is configured for both a Unit Alarm and a High AC Impedance/
	CALIBRATION RECOMMENDED.
6	The unit is configured for both a Low O2 and High AC Impedance/CALIBRATION
	RECOMMENDED.
7	The unit is configured for a Unit Alarm, a Low O2, and a High AC Impedance/
	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 RECOM-
	MENDED 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.

3-4 Startup Rosemount Analytical Inc. A Division of Emerson Process Management