02.00 Function descriptions
SIEMENS AG 6RX1700-0AD76 9-25
SIMOREG DC Master Operating Instructions
Connection example for a USS bus
4 11
14
+
8
6 4
SIMATIC S5
-
Rx Tx
12
10
X3
X3
150
Ω
1)
2)
Rx
Tx
6RA70
-
+
+
Rx
Tx
6RA70
-
+
+
Rx
Tx
6RA70
-
+
+
59 58 59
58
59 58
CP524 with RS485
-module ...0AA43
(Jumper X3: 20-18 -->
2-wire cable)
SUB-D connector
15-pin
Master
(Bus terminating
resistors activated)
Slave 1
(Bus terminating
resistors deactivated)
Slave 2
(Bus terminating
resistors deactivated)
Slave n
(n<=31))
(Bus terminating
resistors activated)
1) The interface cable shields must be connected directly on the converter with the lowest possible
impedance to converter or cubicle earth (e.g. via clamp).
2) Twisted cable, e.g. LIYCY 2x0.5 sqmm; with longer cables, an equipotential bonding conductor
must be used to ensure that the difference in frame potentials between nodes stays below 7 V.
9.13.2 Serial interfaces with peer-to-peer protocol
The term "Peer-to-peer link" refers to a "Link between partners of equal status". In contrast to the
classic master/slave bus system (e.g. USS and PROFIBUS), the same converter can function as both
the master (setpoint source) and the slave (setpoint receiver) in a peer-to-peer link.
Signals can be transferred in fully digital form from one converter to another via the peer-to-peer link,
for example:
− Velocity setpoints for producing a setpoint cascade, e.g. on paper, foil and wire-drawing machines
and on fiber-drawing machinery.
− Torque setpoints for closed-loop load distribution controls on drives that are coupled mechanically
or via the material, e.g. longitudinal-shaft drives on printing presses or S-roll drives
− Acceleration setpoints (dv/dt) for acceleration precontrol on multi-motor drives.
− Control commands
Useful data which can be transferred via the peer-to-peer link
Sheets G173 and G174 in Section 8 show how useful data can be interconnected and list the
parameters relevant for configuring peer-to-peer links. Any connectors can be parameterized as
transmit data (numeric representation: 100% equals 4000h = 16384d).
Parameters cannot be transferred via the peer-to-peer link.
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