LS Industrial Systems XBL-PMEC, User Manual, Page: 27 / 101

Chapter 3 Installation and Test Operation
3 - 3
3.3 Precautions for Installation
During the system configuration using Pnet I / F module, please check the detail contents
as below.
1) Check the necessary basic elements to configure the system, and then select the appropriate
communication module.
2) Select dedicated cable of Pnet to use for Pnet communication module.
3) Make sure whether connectors are damaged or not when you connect between connector
and module.
4) All of communication modules can be equipped with max 2ea regardless of module type. The below
table describes how many expansion module can be attached depending on the type of main unit.
Classification
XBC XEC XBM
High
Performance
Standard
High
Performance
Standard Modular
Max expansion
number
10 modules 7 modules 10 modules 7 modules 7 modules
5) After attaching the module to main unit, lock the module up and then connect the communication
cable.
3.3.1 Installation of cable
Shielded Twisted Pair Cable is used as Profibus cable. The maximum transmission distance by
specification, speed and type of cable is as shown below [Table 3.3.1] and [Table 3.3.2].
Characteristics Type A Type B
Impedance
135~160Ω (freq. 3~20MHz) 100~130Ω (freq. > 100kHz)
Capacity Lower than 30 pF/m Lower than 60 pF/m
Resistance Lower than
110 Ω
-
Conductor Area Larger than 0.34 mm
2
(22 AWG) Lager than 0.22 mm
2
(24 AWG)
[Table 3.3.1] Specification of cable
Baud rate
(Kbit/s)
9.6 19.2 93.75 187.5 500 1500 3000 6000 12000
Cable Type A 1200m 1200m 1200m 1000m 400m 200m 100m 100m 100m
Cable Type B 1200m 1200m 1200m 600m 200m 70m - - -
[Table 3.3.2] Trasmission distance by Cable and Speed
Remark
1) It defines two type of bus cable in Profibus standards. But it is usually recommended Type A
which place is newly installed. The type name of A and B ask to cable maker.
2) AWG(American Wire Gauge): Number system of size(a diameter) of wire