Allen-Bradley 1794ASB Series B User Manual

3–10 Communicating with FLEX I/O Modules
Publication 17946.5.3 - May 1996
Analog I/O Modules
At powerup, the adapter identifies the type of module installed in the
base unit. If the module is an analog module, the adapter will access
15 words of data.
!
ATTENTION: If using Series A modules, do not use
configure select and full range bit settings of 0.
Individual channels revert to 4–20mA with bit
selections of all zeroes. This could result in unwanted
or incorrect action.
!
ATTENTION: The series A adapters and the series B
adapters process block transfers differently. Series A
adapters allow block transfers to continue to occur
even when an analog module is removed from its base.
With series B adapters, when a module is removed
from its terminal base, the series B adapter ceases to do
block transfers to the processor. This provides feedback
to the processor that a block transfer module has been
removed.
The “hold inputs” feature, selectable on the switch
assembly on the adapter, does not apply to analog
modules. If you need this feature, you must simulate it
in your programming.
!
ATTENTION: If the adapter is powered up before
analog modules, the adapter will not recognize the
analog module. Make certain that analog modules are
installed and powered up before or simultaneously with
the remote I/O adapter. If the adapter does not establish
communication with the analog module, cycle power to
the adapter.
To see mapping for: Refer to:
8 input analog module (1794IE8/B) page 3-11
4 output analog module (1794OE4/B) page 3-12
4 input/2 output analog combo module (1794IE4XOE2/B) page 3-14
8 RTD input module (1794IR8) page 3-16
8 Thermocouple/mV input module (1794IT8) page 3-17

Allen-Bradley 1794ASB Series B Specifications

General

Brand	Allen-Bradley
Model	1794ASB Series B
Category	Adapter
Language	English