F977 | F977 |
Combined Terminal Function (Cont.)
Output terminals may also be combined to produce one output response to multiple conditions using the computational operators of Table 11 on pg. 245. Assigning more than one function to a discrete output terminal provides two advantages: it effectively expands the number of input terminals, and reduces the number of cables required to support the input/output functions (e.g., assigning Low Speed Detection and Low Current Detection to one output terminal). Using Virtual Terminals 1 – 4 (F973 – F976) are required to use this function.
In the example below, the Low Speed Signal (detection) terminal assignment and the Low Current Detection terminal assignment will be combined as one terminal output to illustrate this feature. However, any two of the discrete output terminal assignments listed in Table 8 on pg. 241 may be combined in this manner.
Setup (example)
1.Disable the My Function parameter at F977 to prevent the system from starting upon completion of the setup.
2.From Program ⇒ Direct Access ⇒ Unknown Numbers, select Enabled.
3.Set the OUT1 terminal (F130) to My Function Output 1 (222).
4.Set Input Function Target 1 (F900) to 1004 (Low Speed Signal detection). See Table 8 on pg. 241 for a complete listing of available settings.
5.Set Input Function Target 2 (F902) to 1026 (Low Current Alarm). See Table 8 on pg. 241 for a complete listing of available settings.
6.Set Input Function Command 1 (F901) to AND (3). This setting assigns an operator to the Input Function Target 1 and the Input Function Target 2 settings.
7.Set Output Function Assigned (F905) to 1222. This setting will transfer the results of the logical AND to My Function Output 1 (OUT1).
8.Enable the My Function parameter at F977 by selecting My Function Always On.
With the aforementioned setup completed in the example, once the Low Speed Signal AND the Low Current Alarm are active, the OUT1 terminal is activated for the duration of the Low Speed/Low Current condition.
See the My Function Instruction Manual (P/N 58692) for a complete description of the setup requirements and operational information of the My Function parameter.
Direct Access Number — F977
Parameter Type — Selection List
Factory Default — None (Disabled)
Changeable During Run — No
DANGER
This parameter must always be set to None at the start of the My Function setup and remain set to None until all of the My Function parameter settings have been confirmed as being correct.
If enabled for normal operation using settings 1 or 2, the motor may start and engage the driven equipment unexpectedly upon receiving a Run signal during the My Function setup.
234 | H9 ASD Installation and Operation Manual |
