Siemens SIMATIC S7 System Manual page 288

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101BExtended instructions

The pulse width will be set to the initial value configured in device configuration when the

CPU first enters RUN mode. You write values to the Q-word location specified in device

configuration ("Output addresses" / "Start address:") as needed to change the pulse width.

You use an instruction such as a move, convert, math, or PID box to write the desired pulse

width to the appropriate Q word. You must use the valid range for the Q-word value (percent,

thousandths, ten-thousandths, or S7 analog format).

Digital I/O points assigned to PWM and PTO cannot be forced

The digital I/O points used by the pulse-width modulation (PWM) and pulse-train output

(PTO) devices are assigned during device configuration. When digital I/O point addresses

are assigned to these devices, the values of the assigned I/O point addresses cannot be

modified by the Watch table force function.

Table 8- 119 Value of the STATUS parameter

Table 8- 120 Common condition codes

Condition code

If one of these errors occurs when a code block is executed, the CPU goes to STOP mode unless you use the GetError

or GetErrorID instructions within that code block to create a programmed reaction to the error.

PWM identifier does not address a valid PWM.

Area too small for input

Area too small for output

Illegal input area

Illegal output area

Illegal input bit assignment

Illegal output bit assignment

Output area is a read-only DB.

DB does not exist.

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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