Delta-electronics Programmable Logic Controller DVP-PLC Bedienungsanleitung PDF herunterladen (Seite 130)

100

101

2 Functions of Devices in DVP-PLC

DVP-PLC Application Manual

2-102

Device No. 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 PLC is in RUN status.

b) Action steps:

i) When M1170 is enabled, PLC enters the single step execution mode. PLC stays at a specific instruction,

stores the location of STEP in D1170 and executes the instsruction once.

ii) When M1171 is forced “On”, PLC executes the next instruction and stops. At the same time, PLC

auto-force “O ff” 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

Number

M1172 ~ M1174, D1172 ~ D1177

Contents:

1. Special D and special M for two-phase pulse output for SA/SX/SC:

Device No. Function

M1172 Switch for two-phase pulse output (On = enabled)

M1173 On = Continuous output switch

M1174 “Number of pulses reached” flag

D1172 Output frequency (12Hz ~ 20KHz)

D1173 Output mode (K1 and K2)

D1174 The lower 16 bits of the 32 bits for the target number of pulses

D1175 The higher 16 bits of the 32 bits for the target number of pulses

D1176 The lower 16 bits of the 32 bits for the present number of pulses

D1177 The higher 16 bits of the 32 bits for the present number of pulses

2. The function:

Output frequency = 1/1 pulse cycle period (i.e. 1/T; as the figure below)

1 2 ... 125 126 127 128 129 130 131 132 133 134 135 ... 585 586

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