PCMCIA installation
8.5
Connection of the TSX SCP 112 card
At a Glance
Aim of this
Section
What's in this
Section?
This Section deals with the hardware installation for TSX SCP 112 PCMCIA cards.
This section contains the following topics:
Topic
Connection of the TSX SCP 112 card
Connecting in point to point mode
Multidrop connection
Dynamic performance
TSX SCP 112 connection with April 5000/7000 PLCs
Page
197
198
199
200
202
196
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PCMCIA installation
Connection of the TSX SCP 112 card
General
The PCMCIA TSX SCP 112 card is used to connect a Premium/Atrium PLC station to a loop link with a current of 20 mA in point to point or multidrop.
Note: In all cases the power supply is: 24 V
±
20%, external to the TSX SCP
112 card, and must provide the current required for the current loop supply .
The TSX SCP CX 2030 cable is used for this type of connection (length 3 m).
Description of the TSX SCP CX 2030 cable:
The PCMCIA 20-pin mini-connector supports the signals:
J1
9 + Alim
13 EMI mlp
19 + REC
17 - REC
2 EMI pap
20 - Alim
White/Blue
Orange/White
White/Green
Green/White
White/Orange
Blue/White
Note: A screw terminal block needs to be installed to connect the TSX SCP 112 card.
TSX DM 57 xx
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PCMCIA installation
Connecting in point to point mode
General
The diagram below describes the wiring principles for TSX SCP 112 loop current
PCMCIA cards in point to point. Point to point is only carried out according to 20 mA mode when idle.
Illustration:
Station 1
SCP 112
9
19
17
2
20
Station 2
SCP 112
9
19
17
2
20
+
-
24 V
Junction block 1
Junction block 2
Note: Important: the cable shielding must be connected at the shortest point in the junction blocks.
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PCMCIA installation
Multidrop connection
General
Multidrop is only carried out in 0 mA idle mode. The send cable and receive cable are set in parallel. The master is set by the software.
Example of connection of n TSX SCP 112 cards:
Station 1
TSX SCP 112
Station 2
TSX SCP 112
Station 3
TSX SCP 112
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Rc
Junction block 1
Junction block 2
Rc = resistance of optional load
Junction block n
Note: Important: the cable shielding must be connected at the shortest point in the junction blocks.
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PCMCIA installation
Dynamic performance
General
The flow of a current loop link is limited by the cross-section and the length or the cable used.
The user should refer to the two charts below to evaluate the performance which can be obtained using this application.
Point to point
These curves are given for a shielded two pair cable (send through one pair, reception through the other) while observing all the precautions of use. speed in Kbps cable 1 mm
2
4500 m max.
cable 0.64 mm
2
2500 m max.
cable 0.34 mm
2
1300 m max.
Multidrop
The chart below is given for a shielded cable with a conductor cross-section of 0.34 mm
2
. The connection is made according to the parallel multidrop diagram below.
Using conductors with a larger cross-section improves the quality of the signals transmitted:
Number of connected stations
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PCMCIA installation
Multidrop link performance is optimized when there are more connected stations.
The line is busier, which improves the quality of the transmitted signal.
When the connection is made according to the diagram above (See General,
p. 199), the number of stations can be increased artificially (to a maximum of 16
stations) by loading the line at one of its ends.
This can be carried out by incorporating a load resistance.
This load resistance can be connected to any junction block providing it is between pins 17 and 19 of cards TSX SCP 112.
The value of Lr resistance simulating the load of "N" stations is determined by the formula:
Rc =
----------------
N
U
×
20
R in K
Ω
U = external supply voltage
N = station number to be simulated
Example:
An installation is physically made up of 6 stations connected in multidrop with an external 24 V supply.
The performance of the line is that of 10 stations, simulating the load of 4 additional stations by a resistance:
Rc =
---------------
4
24
×
20
= 0 3K
Ω
Note: The load resistance must not have an inductive effect or there is a risk that it will not operate.
Use a thick layer of resistance.
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PCMCIA installation
TSX SCP 112 connection with April 5000/7000 PLCs
General
PCMCIA card TSX SCP 112 20 mA current loop is used to connect April communication modules JBU0220 and JBU0250. The multidrop connection of
PCMCIA card TSX SCP 112 to modules JBU0220 and JBU0250 is carried out in
series mode. To connect April modules refer to reference manual TEM60000E.
Note: Important: You must configure card TSX SCP 112 in point to point mode in the PL7 configuration screen, for both the point to point or the multidrop series.
Note: The current loop authorizes a current of 20 mA when idle, in point to point as well as in multidrop mode.
If a slave is switched off the sender of this slave become active and the line is available.
If the loop supply is offset on one of the slaves, switching this slave off will cause communication to be interrupted.
Point to point link: Module
JBU0220 or active JBU0250
Illustration
White/Blue
White/Green
Green/White
White/Orange
Passive master or slave:
Blue/White
202
Master or slave active
TSX DM 57 xx
PCMCIA installation
Point to point link: active
TSX SCP 112 card
Illustration:
White/Blue
White/Green
Green/White
White/Orange
Blue/White
Master or slave active
Mixed terminal links
Illustration:
White/Blue
White/Green
Green/White
Master or slave: passive receiving active sending
White/Orange
Blue/White
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Master or slave passive
Master or slave: passive receiving active sending
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PCMCIA installation
Multidrop type link
The following examples describe the different wiring possibilities for card
TSX SCP 112 with modules JBU0220/0250.
Note: Important: The 24 V supply of each TSX SCP 112 present on the loop must be connected, whether passively or actively, otherwise the link will not function.
These supplies must not have any shared (potential) point between them. Do not connect the -24 V supply to the earth.
Example 1: Active master TSX SCP 112 multidrop
White/Blue
White/Green
Green/White
Master active
White/Orange
Blue/White
Slave 1 passive
204
Slave 2 passive
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Example 2: active send/receive JBU0220/0250 multidrop
PCMCIA installation
TSX DM 57 xx
Master active sending/receiving
White/Blue
White/Green
Slave 1 passive
Green/White
White/Orange
Blue/White
Slave 2 passive
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PCMCIA installation
Example 3: Multidrop master JBU0220/0250 active send/receive - slaves
TSX SCP 112
White/Blue
White/Green
Green/White
Master active sending/receiving
White/Orange
Blue/White
White/Blue
White/Green
Slave 1 passive
Green/White
White/Orange
Blue/White
Slave 2 passive
206
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Example 4: Multidrop active master TSX SCP 112
White/Blue
White/Green
Green/White
White/Blue
White/Green
Green/White
PCMCIA installation
Master active sending/receiving
White/Orange
White/Orange
Blue/White Blue/White
Slave 1 passive
Slave 2 passive
207
