This constellation applies:
● When one spreader is used which can only pick up one container
● When one double-spreader is operated in single mode, i.e. the waterside spreader has been
pulled up to the upper limit switch
Double-spreader operation (tandem operation)
A landside spreader and a waterside spreader are in use.
One or two containers can be locked and transported.
Twin operation
A twin spreader is in use. This can be extended to 20 ft, 40 ft or 45 ft,
allowing the following to be locked/transported:
● One container in various lengths, or
● Two 20 ft containers on one spreader
The functions are the same as for single-spreader operation.
Combined double-spreader / twin operation
A maximum of four containers can be locked and transported.
6.10.6.2 Lock bits
Two control bits (LOCKED_BIT0 and LOCKED_BIT1) are provided in STW_PLC_COMMON
for sensing the locking state as a function of the spreader constellations.
The meaning of these control bits is as follows:
Table 6-3 Lock bits
LOCKED_BIT0 LOCKED_BIT1 Meaning
0 0 Case A:
No spreader is locked
1 0 Case B:
Either the landside or waterside spreader is locked in double-spreader operation (tan‐
dem operation).
The function is identical to scenario C.
Sway Control function description
6.10 Blocked regions
SC integrated STS, GSU
Operating Instructions, 07/2019, A5E48271265B AA 179
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