Rockwell Automation 1752-L24BBBE SmartGuard 600 Controllers User Manual - Manual (Page 230)

230 Rockwell Automation Publication 1752-UM001E-EN-P - June 2014
Appendix D Function Blocks Command Reference
Two-hand Control Function
Block Figure 56 - Two-hand Control Function Block Diagrams
The Two-hand Control function block enables monitoring the status of a two-
hand switch. The two-hand control function block can be used with a suitable
two-hand switch to meet the requirements of type III C in EN 574, Two-hand
Control Devices, Functional Aspect - Principle for Design.
The output signal turns on only if both inputs from the two-hand switch are
active and satisfy the requirements of EN 574. The Output Enable signal turns
off if the inputs from the two-hand switch do not satisfy the requirements of EN
574, an input is inactive, or if an error in the function block is detected.
Two-hand Control Function Block Optional Outputs
Optional outputs can also be used in programming. To display these optional
outputs, check the appropriate checkbox on the Out point tab of the Function
Block Properties dialog box in the Logic Editor of RSNetWorx for DeviceNet
software.
• Discrepancy Error Pair 1
• Discrepancy Error Pair 2
Two-hand Control Function Block Fault Present Output Setting
The Fault Present output can also be used in programming. To enable this
output, check the Fault Present checkbox on the Out point tab of the Function
Block Properties dialog box.
Two-hand Control Function Block Parameters
Set these parameters for the two-hand control function block.
Table 20 - Two-hand Control Function Block Parameters
Parameter Range Default
Discrepancy Time Input Pair 1 0 … 500 ms in 10 ms increments
(1)
The discrepancy times must be equal to or greater than
the cycle time of the controller.
30 ms
Discrepancy Time Input Pair 2
!
!
!
Output
Enable Output Enable
Discrepancy Error (pair 1)
Default Connections Maximum I/O for Two-hand Control Function
Input 1
(pair 1 - NO)
Input 2
(pair 1 - NC)
Input 3
(pair 2 - NO)
Input 4
(pair 2 - NC)
Discrepancy Error (pair 2)
Fault Present
Input 1
(pair 1 - NO)
Input 2
(pair 1 - NC)
Input 3
(pair 2 - NO)
Input 4
(pair 2 - NC)