6. Installation and Commissioning
GEM80-500 Series Controller
GEM80-500 Technical Manual (T2025En)
(08/04)
Page 6-14
GEM80-500
CONTROLLER
Watchdog
Relay 1
Contact
Watchdog
Relay 2
Contact
Watchdog
Follower
Relay
Suppression
Device
Emergency Stop
Pushbutton
Input Equipment
e.g. Input Modules
Output Equipment
e.g. Output Modules
Watchdog
Follower
Relay Contact
Twisted Pair
Neutral
or - ve
Neutral
or - ve
Neutral
or - ve
Line
or + ve
Line
or + ve
Line
or + ve
H
H
L
L
Watchdog
Plug
Terminal 2
Watchdog
Plug
Terminal 1
Figure 6-7
Typical Watchdog Circuit
6.11
Connections for I/O Modules 9713-4020 and 9713-4021
Connections from the I/O modules to the Basic and Verification I/O are made by 26-
way ribbon connectors. The length of ribbon cables required depends upon each
application and these should be made to suit. Refer to a GEM80-400 Technical
Manual T1614 if information is required to make up ribbon cables.
6.12
Connections for Serial Communications Module 9714-4020
Connections to the Serial Communications Module are made by 9-way, male, ‘D’ type
socket connectors with threaded retention pillars. The length of cables required
depends upon each application and these should be ordered from a proprietary
supplier or separately from ALSTOM to suit the application.
