Read And Set Real-Time Clock Extended - Siemens SIMATIC S7 System Manual

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Read and set real-time clock extended

Non-fatal errors with ENO = 0

0006H Indirect address

0007H T data error

0091H Operand out of range

READ_RTCX, SET_RTCX programming tips

These instructions do not accept Invalid dates. If you enter February 30, for example, a time-

of-day non-fatal error occurs (0007H).

Do not use the READ_RTCX / SET_RTCX instructions in both the main program and in an

interrupt routine. A READ_RTCX / SET_RTCX instruction in an interrupt routine cannot

execute while another READ_RTCX / SET_RTCX instruction is executing. In this case, the

CPU sets system flag bit SM4.3, indicating that two simultaneous accesses to the clock were

attempted resulting in a T data error (non-fatal error 0007H).

The time-of-day clock in the CPU uses only the least significant two digits for the year, so 00

represents the year 2000. User programs that use the year's value must take into account

the two-digit representation.

The CPU handles leap year correctly through year 2099.

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

The Read real-time clock extended instruction reads the current time, date, and

daylight saving configuration from the PLC and loads it in a 19-byte buffer begin-

ning at the address assigned by T.

The Set real-time clock instruction writes a new time, date, and daylight saving

configuration to the PLC using the 19-byte buffer data that is assigned by byte

SM bits affected

IB, QB, VB, MB, SMB, SB, LB, *VD, *LD, *AC

Program instructions

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Simatic s7-200 smart