Specifications

Analog Output Modules
31007715 6/2008 301
Output
Status Registers
The I/O status process image is a reserved block of 4 096 16-bit registers (in the
range 45 392 through 49 487) that represent the status of all the I/O modules (along
with the data for the input modules) on the island bus.
The STB ACO 0220 is represented by two contiguous registers. The first shows the
status for channel 1, and the second shows the status for channel 2. The six LSBs
in each register represent the status of each output channel.
1. Bit 0 represents global status (GS). It has a value of 0 when no errors have been
detected. It has a value of 1 when bit 6 has a value of 1.
2. Bit 2 represents the presence or absence of an over current warning (OCW). It
has a value of 0 when a signed data value is less than or equal to 32 000 or an
unsigned data value less than or equal to 64 000; it has a value of 1 when a
signed data value is greater than 32 000 or an unsigned data value is greater
than 64 000. An OCW does not turn on the GS bit (bit 0).
3. Bit 3 represents the presence or absence of an over current error (OCE). It has a
value of 0 when a signed data value is less than 32 767 or an unsigned data value
is less than 65 535; it has a value of 1 when a signed data value reaches 32 767
or an unsigned value reaches 65 535. An OCE does not turn on the GS bit (bit 0).
4. Bit 4 represents the presence or absence of an under current warning (UCW).
UCW indications can be generated only when the signed output data format is
used. It has a value of 0 when the data value is greater than or equal to 0 and a
value of 1 when the data value is less than 0. A UCW does not turn on the GS bit
(bit 0).
5. Bit 5 represents the presence or absence of an under current error (UCE). UCE
indications can be generated only when the signed output data format is used. It
has a value of 0 when the data value is greater than -1 000 and a value of 1 when
the data value is less than or equal to -1 000. A UCE does not turn on the GS bit
(bit 0).
6. Bit 6 represents the physical status of output channel (HWE). It has a value of 0
when no hardware errors are detected and a value of 1 if there is a broken wire
or the channel is not powered. An HWE turns on the GS bit (bit 0).
STB ACO 0220 Status Register Format
always 0
67
1
23
45
0
1415
9
10
11
12
13
8
not used;
GS (see 1)
not used; always 0
OCW (see 2)
OCE (see 3)
UCW (see 4)
UCE (see 5)
HWE (see 6)
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