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DO Keep Last Value (KLV) and Predefined Value (PDV)
Each output can be configured to KLV or to a PDV (0, 1). This value is executed when the
user program stops or when the module has no communication with the CPU module. Also,
the PDV can be used during normal operation to force a value on the output by ignoring the
user program value (mask).
Reset DO at Startup
It is possible to configure the module to reset all the ML relays positions on startup. This is
set in the STS site configuration.
Table 9-2 ACE3600 DO Relay Module Software Configurable Features
Parameter
DO Keep Last
Value & Pre
Defined Value
DO Mask
Reset DO at
Startup
Relay Inhibiting
(SW selectable)
Sleep Mode
Each DO module can be switched by the user program to Sleep Mode. In Sleep Mode, the
module is not functioning and the power consumption is minimized.
Module Status and Diagnostics
In the event of module failure, the module's ERR LED will be lit. This event is registered by
the CPU in the Error Logger. Module failure status is also visible to the user program.
The DO module can be diagnosed and monitored using the STS Hardware Test utility. This
test verifies that the module is operational, presents the module configuration and shows the
actual value of each output. It is also possible to change the DO's value.
In the Hardware Test utility, it is possible to set the module to Freeze Mode. In this mode, the
DOs will keep the last value they had at the time they were frozen. Freeze mode enables
testing the inputs and outputs while the user program is running.
For details on configuring the DO modules, see the Configuring a Site section and the
Application Programmer section of the ACE3600 STS User Guide.
Selection
KLV/PDV
PDV = 0/1
No /Yes
No/Yes
12V DO (Enabled)/
12V (Disabled)
9-5
Default
Per Module/
Setup
Input
KLV
Output
No
Output
Yes
Module
12V DO
Module
(Enabled)
Digital Output Relay Module
Parameter
Setup Location
Application
Programmer I/O
link table
Application
Programmer I/O
link table
Site
configuration
Site
configuration
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