Yokogawa RotaMASS 3-Series - Manual (Page 15)

IM 01R04B08-00E-E 1st edition February 15, 2012 -00 All Rights Reserved. Copyright © 2012, Rota Yokogawa
<4. GETTING STARTED>
4-1
4. GETTING STARTED
MODBUS is digital communication protocol and differs in operation from 4 to 20 mA transmission and
the HART communication. It is recommended that users use MODBUS devices in accordance with the
procedures described in this section. The procedures assume that MODBUS devices will be set up on a
bench of an instrument shop.
4.1 Wiring in ROTAMASS 3 Terminal Box
Figure 4.1 I/O-Terminal Overview
Wiring:
• Confirm one ferrite core is attached to the flowmeter.
• Insert the power cable into the ferrite core before connecting to the terminals. Fix the ferrite core to the
cable with clamping wire.
• Connect the power cables to the terminals according to the figures below.
• Connect the MODBUS- cables to the terminals according to the figure below.
• For the connection of protective ground conductor to PE terminal of RCCF31 / RCCT3 use a crimp-on
ring type terminal. For RCCR31 connect the protective ground conductor to PE terminal of terminal
board.
The maximum length of MODUS cable depends on different influences. Please see the MODBUS-
specification.
Pulse / Status output 2 (Sout )
Status input (Sin)
Pulse / Status output 1 (Pout)
MODBUS (RS485) -
MODBUS (RS485) +
Analog output 1 (Iout 1)
+ HART communication
F31.EPS
Sout -
Sout +
Sin -
Sin +
Pout -
Pout +
RS485 A
RS485 B
Iout1 -
Iout1 +
NOTE