NOTICE!
Risk of EMC disturbances!
Unshielded cables may cause EMC disturbances.
Always use shielded cables and connect the shield at every device.
NOTICE!
Risk of malfunctions!
The pull-up resistors must be used only one time within a bus line.
Use the pull-up resistors only at 1 master.
The ground potential of the interface COM2 is internally connected to the M ter-
minal of the CPU power supply connector.
The cable shields must be earthed. See CS31 system bus
Ä
Chapter 2.5.4.4 “CS31 bus”
on page 1214.
2.5.4.4 CS31 bus
The AC500-eCo Processor Modules can be used as a CS31 bus master. They cannot be used
as a CS31 bus slave. The connection is performed via the serial interface COM1 used as a
CS31 bus (see chapter Serial Interface COM1
Ä
Chapter 1.2.1.1.3 “Connections” on page 24).
Connection of the bus signals: pin 3 and pin 8.
Bus line
Construction 2 cores, twisted, with common shield
Conductor cross section > 0.22 mm² (24 AWG)
Recommendation 0.5 mm² corresponds to 0.8 mm
Twisting rate > 10 per meter (symmetrically twisted)
Core insulation Polyethylene (PE)
Resistance per core < 100 Ω/km
Characteristic impedance ca. 120 Ω (100 Ω...150 Ω)
Capacitance between the cores < 55 nF/km (if higher, the max. bus length
must be reduced)
Terminating resistors 120 Ω ¼ W at both line ends
Remarks Shielded cables with PVC core insulation and
a core diameter of 0.8 mm can be used up to
a length of ca. 50 m. In this case, the bus ter-
minating resistor is ca. 100 Ω.
Shielded cables with PVC core insulation and a core diameter of 0.8 mm can be used up to a
length of ca. 50 m. In this case, the bus terminating resistor is ca. 100 W.
Connection
Wiring
Wiring Remarks
System Assembly, Construction and Connection
AC500-eCo > Connection and Wiring
2019/04/173ADR010121, 13, en_US1214
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