Siemens SINUMERIK 840Di Function Manual page 1126

Detailed description
2.12 Block descriptions
Signal
Mode
AxisNo
Pos
FRate
InPos
Error
State
FRate
The feed rate in FC 18 can also be specified as:
1. Cutting rate with unit m/min or feet/min
2. Constant grinding wheel surface speed in m/s or feet/s
These alternative velocity settings can be used only if this function is activated by the NC
program. Checkback signals for successful activation can be found in byte 84 on the axis
interface.
Error identifiers
If a function could not be executed, this is indicated by the "Error" status parameter being set
to 'logic 1'. The error cause is coded at block output "State". For a list of the error codes, see
the table in the description of FC 15.
2-214
I/O Type Value range
I Byte 0 to 5
I Int 1 - 31
I Real ∓ 0,1469368 I -38
to
∓ 0,1701412 I +39
I Real ∓ 0,1469368 I -38
to
∓ 0,1701412 I +39
Q Bool
Q Bool
Q Byte 0 to 255
Remarks
0: Pos to absolute pos
1: Pos incrementally
2: Pos shortest path
3: Pos absolute, positive approach direction
4: Pos absolute, negative approach direction
5: Rotational direction as for M4
No. of axis/spindle to be traversed
Rotary axis: Degrees
Indexing axis: Indexing position
Linear axis: mm or inches
Rotary axis and spindle: rev/min
See under table containing info about FRate
1 = Position reached,
or function executed
1 = Error
Error code
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0