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Positioning IP 240

When using an S5-150U or S5-155U (150 mode), note that the ABIT parameter must also be

initialized. In these programmable controllers, an interrupt service OB is invoked at the next block

boundary when the associated bit in PY 0 (I/O byte 0) changes its signal state. By initializing the

ABIT parameter accordingly, you can indicate whether the interrupt service OB is to be invoked

every time the signal state of the interrupt bit changes, or only when the bit goes from ”0” to ”1”.

Initializing the ABIT parameter:

: JU FB 167

NAME : STRU.POS

ABIT : Ky x,y x>0 : The interrupt service OB is to be invoked on every

signal change

x=0 : The interrupt service OB is to be invoked only on a

signal change from ”0” to ”1”

y=0 to 7 : y is the number of the bit in PY 0 that was set on

switchbank S1

Masking interrupts

You can mask all channel bits with interrupt capability by setting control bit AMSK (mask

interrupts) to ”1” and transferring it to the IP 240. Masked interrupts do not trigger an interrupt

request and are not stored in the interrupt request bytes, i.e. they are lost.

Refer to Section 10.13.4 for information on how to transfer the control bits to the IP 240.

10.11 Error Processing after Configuring

If an error occurs during configuring,

• configuring of the channel is aborted and

• the error is flagged in the PAFE byte ( Section 6.4).

Errors in FB parameters are detected by the FB, and are described in more detail in DW 13 of the

specified data block.

Hardware, communications and data errors are flagged by the IP 240, and are read out from the

IP automatically by FB 167 and entered in KH format in data words 8 to 10 of the data block. Data

word 10 always contains the code of the last error detected.

After the error flags have been processed, you must erase the contents of data words 8 to 10 and

DW 13 via the STEP 5 program.

Old communications and data errors are cleared by the configuring FB.

You will find a list of all error codes in Chapter 14.

Note

The PAFE byte should be evaluated after every FB 167 call.

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EWA 4NEB 811 6120-02a

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