Siemens SIMATIC S5 Manual page 130

Message 19
Message 19 contains the minimum values detected when the actual value falls below the first
negative tolerance (see Section 1.1.5). The values are in degrees Celsius or degrees Fahrenheit.
The status of the digital outputs can also be read back.
Fig. 2.5/3 Message 19 (minimum values)
(see Section 1.1.5)
IP244
C79000–B8576–C860–02
Data Exchange with the Central Controller
4–63