Siemens SIMATIC ET 200M Operating Instructions Manual page 207

9.1.3.9 H status (only with S7-400 H and normal redundancy)
Requirements
The IM 153-2 supplies the H status if
● an S7-400H DP master is being worked on (IM 153-2Ax0x, IM 153-2Bx00, IM 153-2Bxx1)
● standard redundant mode is being operated in (IM 153-2Bxx1 with GSD as of rev. 5)
Structure of the H status
Figure 9-7
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
Structure of the H status
Interrupt, error and system messages
9.1 PROFIBUS DP
205