B882–116 24 Vdc Output, Configuration
(Original Document)
About us
This module appears as a B882 module when configured—i.e., the module requires either four 16-bit words—two 3x input registers and two 4x holding registers or 32 discrete 0x outputs and 32 discrete 1xinputs.
The first holding register contains the command state programmed by the user. The input registers contains the faults detected. If an open circuit fault is detected on output point three, then a one is displayed in the 3x register at position three. If a short fault is detected on output point three, then a one is displayed in register 3x + 1 at position three. A one indicates a detected fault, whereas a zero indicates normal operation of that output point.
The module uses only three of the four configured 16-bit words. A point that is shorted disables the output current flow. Once a fault is detected the operation follows the following flow chart if the module is in the pulse test mode of operation. If not in pulse test mode, then reported faults are cleared when a command changes it to the opposite state. In either case the detection of a short will force the point off.
NOTE: The module will not work correctly with a J810 remote I/O processor.
The B882–116 full fault test mode only flow chart is shown in the illustration below.
Data Registers
The B882–116 module mode behavior table is shown below.
Module Mode Behavior
Partial Test Mode
Full (PULSE) Test Mode
Use with high speed field devices
Yes
Not recommended
Finds opens when OFF
Yes
Yes
Finds opens when ON
No
Yes
Reaction to OPEN fault*
No Change
Point OFF
To clear open fault, close physical fault, then
See Note 1
Write 0
Finds shorts when OFF
No
Yes
Finds shorts when ON
Yes
Yes
Reaction to short fault*
Point OFF
Point OFF
To clear short fault, clear physical fault, then
See Note 2
Write 0
*In all cases faults are reported to the PLC via register entries for corresponding point and type of fault(s). In addition, the fault lamp for the corresponding group will blink until fault indication is cleared. Any points with detected short faults will be turned off independent of the command state from the PLC.
Note 1: In partial test mode an open fault indication will be cleared by writing a 1 to the output point independent of the actual status of the output wiring.
Note 2: In partial test mode a short fault indication will be cleared by writing a 0 to the output point independent of the actual status of the output wiring.