Pilz PSS SB FT, Basic license - Manual (Page 46)

6-2 Modular Block System: Burner Management
Standard Function Blocks SB149
• W_V: Time value (watchdog value) of step monitoring time as
multiplier for
W_BA
Permitted value range: - 32768 ... 32767
For W_V
≤
0 to be valid: there is no step monitoring time,
the output parameter W_E is permanently 0.
• W_T: Timer (watchdog timer) for step monitoring time
• D_BA: Time base for step time delay
Following values are valid:
0: 50 ms
1: 100 ms
2: 1 s
3: 10 s
4: 1 min
• D_V: Time value of the time delay as multiplier for D_BA
Permitted vallue range: -32768 ... 32767
For
D_BA
≤
0 to be valid: there is no time delay,
the output parameter D_E changes immediately from 0 to 1 as
soon as a step is activated.
• D_T: Timer for time delay
Output parameters
• NEXT: Gives the status of the step
NEXT = 1: step is active
• W_E: Output parameter for step monitoring time
W_E = 1: timer for the step monitoring time has elapsed.
• D_E: Output parameter for the time delay
D_E = 1: timer for the time delay has elapsed.
Function:
• Control of work cycles
• By adding together several SB149 blocks, a step sequence can be
established
• One PSS can control and monitor several work cycles (e.g. burner), in
which each cycle is allocated a separate sequence