Pilz PSS SB FT, Basic license - Manual (Page 51)

Modular Block System: Burner Management 6-7
• Deactivating a step
During burner start-up, the input parameter STEP is set for one cycle.
The burner’s corresponding blocks evaluate this signal and reset the
sequence.
• Starting the initial step in a sequence:
The input parameter RDY may not be assigned a communication flag
(M100.00 - M104.31) nor an input.
When using SB152 “Burner: Start and operator elements”, the output
parameter
STEP is set for the duration of a cycle, and the enable ENBL
is set. This parameter can be used to start the initial step.
Version 1: no conditions for the start of the initial step
The operand for the parameter
STEP can be assigned to the input
parameter STEP of SB149 and the same operand can also be assigned
to the input parameter RDY.
The input for the step enabling conditions COND can be permanently
assigned with RLO1 (M110.01).
Example:
Version 2: conditions for the start of the initial step are present
The operand for the parameter
STEP may not be assigned directly to the
input parameter RDY.
Example:
L M 70.08 .Step_1
S M 70.10 .RDY Step_1
SB149
STEP
M 70.08 .Step_1 - X - RDY
M 110.01 .RLO1 - X - COND
M 70.08 .Step_1 - X - STEP
B - W_BA
W - W_V
Z - W_T
B - D_BA
W - D_V
Z - D_T
NEXT - X
W_E - X
D_E - X