Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 79)

Publication 1753-UM001C-EN-P - March 2010 79
Wire and Configure the 1753-IB8XOB8 Module Chapter 7
negative-switching outputs. The total output current of the module is
limited to 8 A and is generated from the 24V of the system.
If configured for two-pole operation, the positive-switching output
DO4 operates with the negative-switching output DO4- and the
positive-switching output DO8 operates with the negative-switching
output DO8-. Line control is carried out for detection of an external
short-circuit between positive and negative-switching outputs. A
switch-on delay is necessary for inductive or capacitive load or lamp
load because the inrush of these loads may be mistakenly detected as
a short-circuit. This delay is set in the RSLogix Guard PLUS! Hardware
Management via the Switch-on delay signal at the negative-switching
output variables. The delay can be set from 0…30 ms, in 1 ms
increments. An external line break will not be detected.
An output is in a safety state when it is de-energized. When a fault
occurs, all outputs are switched off.
Outputs 1…3 and 5…7 can have a load of 0.5 A. Outputs 4 and 8 can
each have a load of 1 A at the maximum ambient temperature 60 °C
(140 °F), 2 A at an ambient temperature of 40 °C (104 °F).
The negative-switching outputs DO4- and DO8- can supply up to 1 A
at the maximum ambient temperature of 60 °C (140 ° F), 2 A at an
ambient temperature of 40 °C (104 °F).
With an overload, one or all of the outputs are turned off. When the
overload is eliminated, the outputs are activated again.
Signals for Output Configuration
Set up these signals for 1753-IB8XOB8 modules by using the Outputs
tab of the digital outputs Signal Connections dialog box in RSLogix
Guard PLUS! software.
See Appendix B for a complete list of 1753-IB8XOB8 variables.
L+ Switching L-Switching Description Notes
DO1[xx].Value
(outputs 1 to 8) DO2[xx].Value
(outputs 4- and 8-) Output value for digital output channels 1 = output is set
0 = output is not set; no current
— DO2[xx].2-pole Configures the channel for 2-pole
operation 1 = channel DO2[01] (4-) is used for 2-pole operation
with channel DO1[04] or channel DO2[02] (8-)is used
for 2-pole operation with channel DO1[08]
0 = channel DO2[xx] is not used for 2-pole operation.
— Switch-on delay Sets switch-on delay for 2-pole tests, due
to lamp load, inductive and capacitive load