Circutor computer PLUS-TF Series Manuale Utente Scaricare il pdf (Pagina 66)

Table 13-1.- Connection of CPC3i to Computer plus

 The connection diagrams of the complete unit are shown on Fig. 2 and 3.

 Each CPC3i card of a static capacitor bank must be configured with a different address (1 to 16) for each

step, using a rotating ADJ switch with the CPC3i card.

CPC3i-xMRS

Mando RS485

230V

400V

2G2

2K2

2G1

2K1

TR1

3G2

3K2

3G1

3K1

1K2

1G2

1G1

1K1

TP3

TP2 TP1

LED

PH3

LED

PH2

LED

PH1

RS+

RS-

AL1

COM

JP1

LED

CPU

TEST

ADJ

A B C D E F G

Fig. 121.- Terminals of the CPC3i-xRS card

Fig. 122.- Terminals of card A of Computer plus

13.1 MODBUS Control frame

Computer plus controls the CPC3i cards with the MODBUS protocol. In particular, it sends a frame every

20 ms, using the 15 function (N bits write). The message is a "broadcast" message, i.e., it will be read by all

cards, in any address. The format of the frame is as shown on Fig. 123.

The message is composed of a frame sent to the slave address 00H (broadcast, i.e., all CPC3i cards receive

all frames). The 1r bit address on the CPC3i card is 00H – 64H and the frame has 64 bits (00H – 40H),

grouped in 8 octets.

1 2 ... 61 62 63 64 65 66 67 68 69

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Circutor computer PLUS-TF Series Manuale Utente Pagina 66

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