Connection To Plc Via Analog Output - SPM Machine Guard MG4-REF11A Instruction Manual

8
DCS
Connecting
terminals for
AI = analog input
(4 - 20 mA) and
DI = digital input
(relays),
and power

Connection to PLC via analog output

To connect an MG4-REF11A unit to a PLC, one uses a shielded cable with twisted conductor pairs.
The analog 4-20 mA outputs of the MG4-REF11A are connected to an AI unit (analog input), the
relays to a DI (digital input) unit.
The condition monitoring parameters are set up in the MG4-REF11A. Control, display and data
storage are handled by the PLC.
PLC = Programmable Logic Control
CPU = Central Processing Unit
AI = Analog Input
AO = Analog Output 4-20 mA to an external display
DI = Digital Input
DO = Digital Output 0 or 24 V to an external relay
DCS = Distributed Control System
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden
Tel +46 152 225 00 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.com
Machine Guard MG4-REF11 A
Power supply
Shield connected to ground
Shielded cable, twisted pairs
4-20 mA from the MG4-REF11A
0 or 24 V from a relay in the MG4-REF11A
Power supply
Shield not
connected
Technical data are subject to change without notice.
ISO 9001:2000 certified © SPM 2017-09. 71947 B