Eaton ELC-PB, Programming Manual

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c) Note: This example is just an application method that user should adjust parameters settings
used in
d) acceleration/deceleration segment according to actual machine characteristics and limitation.
Function Group
Single Step Execution
Number M1170, M1171, D1170
Contents:
1. Special D and special M for single step execution for the ELC-PV:
Function
M1170 Start flag
M1171 Action flag
D1170 STEP No. of the currently executed instruction
2. The function:
a) Execution timing: The flag is valid only when the ELC is in RUN status.
b) Action steps:
i) When M1170 is enabled, the ELC enters the single step execution mode. the ELC stays
at a specific instruction, stores the location of STEP in D1170 and executes the
instruction once.
ii) When M1171 is forced “ON”, the ELC executes the next instruction and stops. At the
same time, the ELC auto-force “OFF” M1171 and stops at the next instruction. D1170
stores the present STEP value.
iii) When Y output is in single step execution mode, Y outputs immediately without having to
wait until END instruction is being executed.
3. Note:
a) Instruction that will be affected by scan time will be executed incorrectly due to the single
step execution. For example, when HKY instruction is executed, it takes 8 scan times to
obtain a valid input value from a key. Therefore, the single step execution will result in
incorrect actions.
b) High-speed pulse input/output and high-speed counter comparison instructions are
executed by hardware; therefore, they will not be affected by the single step execution.
Function Group 2-phase Pulse Output Function
Number M1172~M1174, D1172~D1177
Contents:
For the ELC-PC/PA/PH Controllers, the definition of special D and special M of 2-phase output
function:
Function Explanation
M1172 2-phase pulse output switch
M1173 ON is continuous output switch
M1174 Output pulse number attained flag