156
Operating Instructions – Electronic Motor DRC.-..-DAC
9
Transmitting individual parameters via AS-Interface
Communication with AS-Interface Double Slave GLK31A
9.3.2
CTT2 protocol via AS-Interface
You can use the GLK31A double slave to exchange MOVILINK
®
parameters between
an AS-Interface master and a DRC inverter.
The B-slave with slave profile S-7.A.F.5 uses the CTT2 protocol. For a description of the
profile, refer to the appendix of the "Complete AS-Interface Specification Version 3.0,
Revision 2, July 9, 2008".
Transmission time
for a parameter
System-related transmission times occur during data exchange between the DRC B-
slave and the AS-Interface master using the CTT2 protocol. These transmission times
mainly depend on the number of slaves in the AS-Interface network.
The following diagram shows the connection between the transmission time for a
MOVILINK
®
parameter and the number of AS-Interface slave addresses:
SEW-EURODRIVE recommends to add a safety factor to those values.
Controlling the DRC inverter via the cyclical data bits of the A-slave continues even
during the transmission of parameters of the B-slave.
2440779659
t
Transmission time for a parameter
N
Number of AS-Interface slave addresses
N
t
[s]
1
10
1
20
31
2
3
0,3
1,5
2,8
4,3
