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8
Signal timing diagrams
8.1 Selecting a measurement program
8.1.1 Changing the measurement program without program
acknowledgement
Diagram 89: Changing the measurement program without program acknowledgement
Cycle
a. The controller applies the required program number (binary encoded) to the address
inputs and checks whether the DIGIFORCE
®
9311 is ready ("OUT_READY" =1).
b. The controller sets the strobe signal ("IN_STROBE" = 1) in order to transfer the
program number.
c. On detecting the strobe signal, the DIGIFORCE
®
9311 sets the READY signal to "0".
d. At the end of the program-selection cycle, the DIGIFORCE
®
9311 enables the output
signal "OUT_STROBE" as the acknowledgement for the external PLC. On detecting
the "OUT_STROBE" signal form the 9311, the PLC can reset the initiating control
signal "IN_STROBE" ("IN_STROBE" = 0).
e. After “IN_STROBE” has been reset, the DIGIFORCE
®
9311 sets the READY signal
and resets “OUT_STROBE”. Only then the cycle is completed.
Tip
You can connect unused address inputs permanently to Ground potential.
Note:
This applies only to all unused inputs! Otherwise outputs can be triggered incorrectly if extreme
interference fields exist or there are large fluctuations in the PLC supply potential with respect to
Ground potential.
Summary of Contents for DIGIFORCE 9311
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