Control Actions For "Mdi" Mode (Examples) - Siemens SIMATIC S7-300 Manual

Handling by the The table below gives you an overview of how to handle this mode.
user
Note
Please see also Section 9.1.3!
Control actions Preconditions:
Table 9-7

Control actions for "MDI" mode (examples)

Signal name
Control action 1, define position
Transfer MDI block (job no.
6)
Control signal:
Start [ST]
Checkback signals:
e.g. Travel plus [FR+]
Start enable [SFG]
Processing in progress [BL]
e.g. Travel plus [FR+]
Processing in progress [BL]
Position reached, stop [PEH]
Control action 2, change position during positioning
Transfer MDI block on–the–
fly (job no. 16)
Checkback signals:
Travel plus [FR+]
Travel minus [FR–]
FM 354 Servo Drive Positioning Module
Triggering of movement
Start
"MDI block on-the-fly" transmitted
to the FM 354
The FM 354 has been parameterized.
The mode has been selected and confirmed
Drive enable [AF] = 1 (control signal, FC MODE_WR)
Stop [STP] = 0 (control signal, FC MODE_WR)
Servo enable (RF) = 1 (FC MODE_WR, job no. 10)
Axis is synchronized
Level
When the MDI block has been transferred, [ST] can be initi-
ated.
The axis cancels the [SFG] and outputs messages [BL] and
[FR+]
When the defined position has been reached, the axis enables
[PEH]; [SFG] and checkback signals [FR+] and [BL] are
reset.
If a new "MDI block on–the–fly" is transferred during posi-
tioning, the current positioning operation is canceled immedi-
ately, and the new positioning operation is started on–the–fly.
In this case, for example, this causes the direction to be
changed from [FR+] to [FR–].
Description of Functions
Type of movement
as defined by "MDI block"
(job no. 6)
as defined by "MDI block on–the–
fly"
(job no. 16)
Explanation
9-27