Rockwell Automation 440C Guardmaster 440C-CR30 Configurable Safety Relay User Manual - Manual (Page 60)

60 Rockwell Automation Publication 440C-UM001C-EN-P - November 2014
Chapter 9 Safety Monitoring Functions
Reset The reset block is used in safety functions that require a manual intervention to
turn on the safety system.
Figure 55 - Reset Function Block
To prevent inadvertent actuation of the reset block, the reset requires a leading
edge and trailing edge within a specific time frame. The pulse width must be
between 250…3000 ms. If the pulse width is too short or too long, the reset
function will not be executed.
Figure 56 - Reset Timing
The reset block is a Safety Monitoring Function in the CCW. For a valid Reset
operation, according to the requirements specified in the approved safety
concept, you must use the default Reset timing and leave the input filter setting
“0”.
The filter setting is enabled in CCW versions previous to Rev 7. A filter time
setting greater than “0” extends the Reset Timing by 2 x Filter Time.
The reset input signal can come from either one input wiring terminal or over the
Modbus communication input. The available input selections are:
• EI_00…EI_11 (embedded input terminals 00…11)
• MP_12…MP_17 (multi-purpose terminals 12…17)
• P1_00…P1_03 (plug-in 1 terminals 00…03)
• P2_00…P2_03 (plug-in 2 terminals 00…03)
• SP_00…SP_15 (Modbus inputs 00…15)
+24V DC
24V Com
250ms to
3000 ms