Pepper Computer Modular Computers RS485 - Manual (Page 318)

SMART I/O User’s Manual
October 01, 1996 ©1996 PEP Modular Computers GmbH Page 6- 36
Chapter 6 Communications Modules
6.2.13 ISaGRAF Programming
6.2.13.1 The ISaGRAF Board Parameters
Because this module has not been defined as a physical board in the
ISaGRAF project, it has been created as a function block as shown in
figure 6.2.13.1.1.
Figure 6.2.13.1.1 Function block of the SM-SSI Module
Command
One of:
FB_SSI_INIT
This is the command that must be executed to
initialize the module before operating the SSI
interface - normally at the beginning of an
ISaGRAF program cycle. Also, prior to using
this call, if the ctrlx variables have been
defined with a value, then these will be sent to
the SM-SSI Module.
FB_SSI_SETPOINT
This gives the user the possibility to enter a
value for the comparator register when testing
for a match between the actual read-back
value and the desired value. The compare
value should be defined prior to using the call.