Mitsubishi Electric FR-A 500, Instruction Manual

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12
Figure 2-3. Connection Cable
NOTE: The DB9 pinout described in the table below is defined by the
Profibus Standard DIN-19-245 Part 1. The two data signals are
named RXD/TXD+ and RXD/TXD-. However, manufacturers of RS-
485 driver ICs typically refer to these signals as A and B’. The
Profibus signal RXD/TXD+ is typically assigned to the RS-485 sig-
nal A and the RXD/TXD- to B’. Some Profibus-DP implementations
confuse these two signals. If you are having trouble establishing
communications from the FR-A5NP to your Profibus-DP master,
verify that the proper data signal assignments are made. It may be
necessary to swap these two signal lines.
NC — No Connection
(6) To terminate the network at the option unit, install termination resistors
at the terminal block as shown in Figure 2-5. Each PROFIBUS network
has two ends. Units at both of those ends must be properly terminated.
DB-9
Pin
A5NP Internal
Signal Name
Profibus-DP
Signal Name Comments
1 NC No Connection
2 NC RP Reserved for Module Power
3 A RxD/TxD+ Receive/Transmit-Data+
4 RTS CNTR+ (Request to Send)
5 Isolated GND DGND (V-) Data Ground
6
Is5Vdc
Supply
V+ (+5Vdc)
7 NC No Connection
8 B' RxD/TxD- Receive/Transmit-Data-
9 NC RP Reserved for Module Power