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Interface to the User Program in the S7-200 CPU

2-14

SIMATIC NET CP 243-2 AS-i Master

C79000-G8976-C142/02

2.4.2 Error Register in the Analog Module

Meaning for the User Program

With this register, the CP 243-2 signals errors to the user program.

Structure of the Error Register

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

0 0 0 0 0 APF 0 CER

Bit Description/Range of Values

Table 2-3

Bit

Value Meaning

CER 0 AS-i configuration correct (only in the protected mode)

The “CER” LED is off

1 AS-i configuration error (only in the protected mode)

This indicates a difference between the slave configuration

detected on the AS-i cable and the desired configuration

configured on the CP 243-2.

The “CER” LED is lit (see Section 1.8.1 Status Display of the

CP 243-2).

APF 0 AS-i voltage correct

The “APF” LED is off.

1 AS-i Power Fail.

This indicates that the voltage supplied on the AS-i cable by the

AS-i power supply unit is too low or there is a complete power

outage.

The “APF” LED is lit (see Section 1.8.1 Status Display of the

CP 243-2).

Note

The “CER” bit indicates configuration errors only in the protected mode. In the

configuration mode, the “CER” bit is always “0”.

The “CER” LED, on the other hand, indicates configuration errors both in the

configuration mode and in the protected mode.

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Siemens SIMATIC NET Manual de servicio Pagina 40