Spectrum Controls 140 ACI 051 00sc - Manual (Page 29)

Installation Instructions
32-Channel Analog Input Module
Quantum Series 140 AxI 05x 00sc
24
Bit 8: Channels 1-4
Bit 7: Channels 5-8
Bit 6: Channels 9-12
Bit 5: Channels 13-16
Bit 4: Channels 17-20
Bit 3: Channels 21-24
Bit 2: Channels 25-28
Bit 1: Channels 29-32
4x Reserved: Bit 9
Bit 9 is reserved. Bit 9 should be set to a “0.”
4x Autosequence Disable: Bit 10
Auto sequence allows the module to automatically sequence through the
eight groups of a data presented in the 4x registers. When acquiring data
it is necessary to identify which group sequence is currently loaded. This
is done by referencing the group number which may be found in the
status word group ID (3x+9 Bits 15-16)
When the Autosequence Disable bit is set (Bit 10=1), the module reads
only the eight channels identified by the Group Select Bits. If
Autosequence Disable is disabled (Bit 10=0), Autosequence mode will be
in effect. When in autosequence mode, the module ignores the channel
group select in the 4x+0 configuration word, and instead sequences
through all four groups automatically. The values in the eight data
registers belong to the group identified in the status word group ID (3x+9
bits 15 and 16). The user must set aside 32 registers as a permanent
image of the channel data. During run time, the ladder need only deter-
mine the current group for the eight data registers (3x+0 through 3x+7) in
order to determine where the data should be copied into the 32 register
channel image.
When autosequence is disabled, the user must manually increment the
group select in the configuration word and the module sends back only
the data requested.
Sample ladder logic for both techniques is provided in section 6.3.