Siemens KS7 Series Specifikace stáhnout pdf (Strana 149)

Communications Mode CP 523

7.4.1 Reading the Status Byte, the Status of the Peripheral Device and the

Current Clock Data

As soon as job request 0000

has been transferred to the CP, the CP writes the following into the

transfer memory:

• The status byte (byte 0)

• The status of the peripheral device (byte 1)

• The current clock data (bytes 1 to 7)

The return info is the same for job requests:

• 1000

: ”Set clock”

• 90XX

: Transfer parameter setting

Table 7-22. Status Information and Current Clock Data

Possible ValuesByte Meaning

0 Status byte 7.24

1 Status of the peripheral device

Bits 4 to 7: Peripheral device ready

Peripheral device not ready

Bits 0 to 3: Current day of the week

1=Sunday, 2=Monday, 3=Tuesday, 4=Wednesday

5=Thursday, 6=Friday, 7=Saturday

BCD

to X7

BCD

2 Current day 01

BCD

to 31

BCD

3 Current month 01

BCD

to 12

BCD

Current year 00

BCD

to 99

BCD

Current hour

24 h clock

12 h clock a.m.

12 h clock p.m.

BCD

to 23

BCD

to 12

BCD

to 92

BCD

6 Current minute 00

BCD

to 59

BCD

Current second 00

BCD

to 59

BCD

Status byte (byte 0)

The status byte provides information on

• errors during data interchange between CP and I/O device

• the status of a CPU job

• the status of the CP 523

• battery backup

The status byte is divided into two half-bytes. Both half-bytes are independent of each other. They

can be combined in any way.

7-44

EWA 4NEB 811 6044-02a

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 256 257

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