Spectrum-controls 1734sc-OE2CIH Uživatelský manuál stáhnout pdf (Strana 51)

Chapter 4: OE2CIH and HART 4-15

User’s Manual Pub. 0300272-01 Rev. A.0

HART STATUS BYTE 3: Extended Device Status

This is the first byte returned with Command 9 by HART revision 6 and 7 devices. It is

not used and always zero (0) for HART revision 5 devices:

Bit Mask

Definition

0×04 =

Critical Power Failure

0×02 =

Device Variable Alert

0×01 =

Maintenance Required

Output Instance (102)

Table 4-10 Output Assembly

Instance:

ID:

Description:

Total Size:

Output

102

Output words

6 bytes

Bit

Output

6 bytes

0×00 to 0×05

High Byte–Channel 0 Output

Low Byte–Channel 0 Output

High Byte–Channel 1 Output

Low Byte–Channel 1 Output

High Byte–Channel 1 Unlatch Alarms

Low Byte–Channel 0 Unlatch Alarms

Unlatch Alarm Bits

The unlatching is performed when the unlatch bit is set (1) and the alarm condition no

longer exists. If the alarm condition persists then the unlatch bit has no effect. It is up to

you to keep the unlatch bit set until you get verification from the appropriate channel

status word that the alarm status bit has cleared (0). It is then up to you to reset (0) the

unlatch bit. The module will not latch an alarm condition if a transition from no alarm

condition to alarm condition occurs, and the unlatch bit is set (1).

Word/Bit

Channel Alarm Unlatch

UOC1

UH1

UL1

UOC0

UH0

UL0

Bit 0: UL0 Unlatch Low Clamp Alarm Channel 0

Bit 1: UH0 Unlatch High Clamp Alarm Channel 0

Bit 2: UOC0 Unlatch Open Circuit Alarm Channel 0

Bits 3~7: Reserved. Set to 0

Bit 8: UL1 Unlatch Low Clamp Alarm Channel 1

Bit 9: UH1 Unlatch High Clamp Alarm Channel 1

Bit 10: UOC1 Unlatch Open Circuit Alarm Channel 1

Bits 11~153~7: Reserved. Set to 0

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 73 74

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