GE EPM9450Q - Manual (Page 285)

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The action keys specify the instance number for an object to perform an action on.
The following action keys are possible:
Action Key Setpoint
Supported Meaning
0 - No action
1000-1004 STD HS Clear digital input counter 0-3 (Status input counter 1-4), 4=ALL
1100-1102 STD HS Operate Relay #1 to 3
1C00-1C04 STD HS same as 1000-1004
A400-A407 STD HS Waveform Capture channels #1 to 8
A500 STD HS Waveform Recorder
Action keys marked with STD are supported by Standard Setpoints (1–11), action
keys marked with HS are supported by High Speed Setpoints (1–6).