CHAPTER 5: SETTINGS PRODUCT SETUPB30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-1255Figure 5-52: Control pushbuttons (enhanced front panel)An additional four control pushbuttons are included on the standard front panel when the B30 is ordered with the 12 user-programmable pushbutton option.Figure 5-53: Control pushbuttons (standard front panel)Control pushbuttons are not typically used for critical operations and are not protected by the control password. However,by supervising their output operands, the user can dynamically enable or disable control pushbuttons for security reasons.Each control pushbutton asserts its own FlexLogic operand. Each operand need to be configured appropriately to performthe required function. Each operand remains asserted as long as the pushbutton is pressed and resets when thepushbutton is released. A dropout delay of 100 ms is incorporated to ensure fast pushbutton manipulation is recognizedby various features that can use control pushbuttons as inputs.An event is logged in the event record (as per user setting) when a control pushbutton is pressed. No event is logged whenthe pushbutton is released. The front panel keys (including control keys) cannot be operated simultaneously—a given keymust be released before the next one can be pressed.Figure 5-54: Control pushbutton logic
