Siemens SIMATIC S5 - Page 161

Programming Instructions
Software synchronization (SS)
Hardware synchronization
(SH)
Parametrize the working data block as shown below.
DW n
DW n+l
DW n+2
DW n+3
DW n+4
DW n+5
DW n+6
DW n+7
SS or SH
Track number User
DB
Track identifier bits, channel I
Track identifier bits, channel 2
Assigned ST parameter
O or 255
Alarm bit O to 7
R 02/92
KS
Input
w
Input
Unaffected
Unaffected
KM
output
KM output
KM Output of control bits
KY
Input *)
*) This parameter is used for PLCS S5–150U/S and S5–155U in 150U mode during interrupt
processing (see section 9.4.8).
Supply data word DL n+l with the value 32 (33) to synchronize channel 1 (2).
The data block number of the user data block (DR
n+l) must be the same data block number
used also during startup in connection with function block FB 156.
When the “SH” command is used, the NV values are transferred without the SS bit; this is required
for hardware synchronization with preliminary contact and zero mark (see operating instructions).
When the “SS” command is used, the NV values are transferred with the SS bit; this provides a
software synchronization of the counters. Synchronization should only be used for incremental
encoders.
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1P 241 Equipment Manual
@ Siemens AG 1969, Order No.: 6ES5 998-0KD21
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