Rockwell-automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Instrukcja Użytkownika Pobierz pdf (Strona 39)

Publication 1769-UM019A-EN-P - October 2008 39

Module Data, Status, and Channel Configuration Chapter 3

Output Data File

The output data table lets you write analog output data and unlatch

command data to the module with the control program and bit access.

The data table structure is shown in the table below. For each

module, slot x, words 0 and 1 in the output data file contain the digital

values of the data to be converted to analog signals by the module

outputs. The most significant bit (MSB) is the sign bit, in two’s

complement format. ‘Nu’ indicates not used with the bit set to zero.

Cancel Input Alarm Control Bits (CLL0…CLL3 and CLH0…CLH3)

These bits are written during Run mode to cancel any latched low-

and high-process alarms. The alarm is unlatched 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 until the alarm

condition no longer exists. You need to keep the unlatch bit set until

verification from the appropriate input-channel status word that the

alarm status bit has cleared (0). Then you need to reset (0) the unlatch

bit. The module will not latch an alarm condition if a transition from

‘no alarm’ to ‘alarm’ occurs while a channel’s cancel latch bit is set.

Cancel Output Clamp Flag Control Bits (CLO0…CLO1 and

CHO0…CHO1)

These bits are written during Run mode to cancel any latched low and

high clamp status bits. The status bit is unlatched when the unlatch bit

is set (1) and the clamp condition no longer exists. If the clamp

condition persists, then the unlatch bit has no effect until the clamp

condition no longer exists. You need to keep the unlatch bit set until

verification from the appropriate output-channel status word that the

clamp status bit has cleared (0). Then, you need to reset (0) the

unlatch bit. The module will not latch a clamp status bit if a transition

from no alarm to alarm occurs while a channel’s cancel latch bit is set.

Word/

Bit

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Word 0 SGN Analog Output Data Channel 0 0 0

Word 1 SGN Analog Output Data Channel 1 0 0

Word 2NuNu NuNu NuNu NuNuCLI3CHI3CLI2CHI2CLI1CHI1CLI0CHI0

Word 3NuNu NuNu NuNu NuNuNuNuNuNuCLO1CHO1CLO0CHO0

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 93 94

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Rockwell-automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Instrukcja Użytkownika Strona 39