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8-10

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

8.9 Reset Coil

The Reset Coil instruction is executed only if the RLO = 1. If the RLO = 1,

this instruction resets its specified address to 0. If the RLO = 0, the

instruction has no effect on its specified address. The address remains

unchanged.

The Reset Coil instruction is affected by the Master Control Relay (MCR).

For more information on how the MCR functions, see Section 20.5.

Table 8-8 Reset Coil Element and Parameter

LAD Element Parameter Data Type Memory Area Description

BOOL

TIMER

COUNTER

I, Q, M, T, C,

D, L

The address indicates the bit that is to

be reset.

Status Word Bits

BR CC 1 CC 0 OV OS OR STA RLO FC

Write – – – – – 0 x – 0

I 0.0

I 0.2

I 0.1 Q 4.0

The signal state of output Q 4.0 is reset to 0 if one

of the following conditions exists:

S The signal state is 1 at inputs I 0.0 and I 0.1

S Or the signal state is 0 at input I 0.2

If the RLO of the branch is 0, the signal state of

output Q 4.0 remains unchanged.

Figure 8-8 Reset Coil

Description

Bit Logic Instructions

1 2 ... 103 104 105 106 107 108 109 110 111 112 113 ... 317 318

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