Input/Output Address Areas; Overview Of The Internal Module Registers; Watchdog Control Register; Watchdog Counter Register - Siemens SIMATIC IPC227G Operating Instructions Manual

Technical specifications
7.5 Hardware descriptions
7.5.5

Input/output address areas

7.5.5.1

Overview of the internal module registers

The following addresses are used for the internal registers:
Addresses
SIO logic device 8 CR F0h
SIO logic device 8 CR F1h
SIO logic device 8 CR F2h
SIO logic device 7 CR E9h
SIO logic device 7 CR FDh
For more information and reference code for accessing to Super IO, contact Siemens
Technical support.
7.5.5.2

Watchdog control register

Bit
0
1
2
3
4 to 7
7.5.5.3

Watchdog counter register

Bit
0 to 7
84
Input/output unit
Watchdog control register (Page 84)
Watchdog counter register (Page 84)
Watchdog state register (Page 85)
Control register user LED L1/L2/L3 (Page 85)
Battery status register (Page 85)
Read/Write Meaning of the bits
state
Read/Write Watchdog Timer I Pulse or Level mode select:
• 0: Pulse mode
• 1: Level mode
Read/Write Not used for watchdog
Read/Write Not used for watchdog
Read/Write Select Watchdog Timer I count mode.
• 0: Second Mode.
• 1: Minute Mode.
Reserved
Read/Write Meaning of the bits
state
Read/Write Watch Dog Timer I Time-out value. Writing a non-zero value to the
register causes the counter to load the value into the Watch Dog Counter
and start counting down. The accuracy of watchdog timer I about one
cycle deviation. Non-zero value will be reloaded to the Watch Dog Counter
and the countdown resumes. Reading the register returns the current
value in the Watch Dog Counter but not the Watch Dog Timer Time-out
value.
• 00h: Time-out Disable
• 01h: Time-out occurs after one cycle time, the cycle time is based on
LD8 CRF0, bit[3], by analogy.
Operating Instructions, 07/2022, A5E50059933-AC
SIMATIC IPC227G