. . . . .
OMRON SCIENTIFIC TECHNOLOGIES INC.
Fremont CA USA
Tel: 1/888/510-4357 in USA and Canada
© OSTI 1209 PN99584-0050 Rev. E
Original Instructions
25
6 D
IAGNOSTIC
AND
T
EST
F
EATURES
6
6.1. DIAGNOSTIC DISPLAY
A two-digit numeric display on the front of the controller indicates system status. The table below
provides the operating mode codes. A full listing of diagnostic codes can be found in Section 12
Troubleshooting.
Table 6-1
Display Code Description
00 Normal Operation
01 Waiting for Start or Program Input
02 Normal Operation
Floating Blanking Active
03 Normal Operation
Channel Select Active
04 Normal Operation
Floating Blanking and Channel Select Active
Operational Display Code Summary
6.2 INDIVIDUAL BEAM INDICATORS
The 4700 system has a visible, red Individual Beam Indicator (IBI), adjacent to each infrared beam.
These IBI’s are located on the receiver. The IBI will light when the infrared beam fails to meet the
conditions necessary for the 4700 system to remain in the machine run state.
IBI’s are not a safety critical component. An IBI failure will not cause an alarm condition and the 4700
system w
ill cont
inue to operate.
6.3 MACHINE PRIMARY CONTROL ELEMENT (MPCE) MONITORING
MPCE monitoring is an important safety function. It monitors the 4700 system interface to the guarded
machine and checks to ensure that the control elements are responding correctly to the light curtain and
to detect any inconsistency between the two machine MPCE.
Connections for MPCE monitoring are made at the controller on terminals 10 and 11 for the DIN
c
ontroller and on TB7 te
rminals 1 and 2 for the metal chassis controller. For a detailed diagram, see
Section 10 Connecting To The Machine Control Circuit. On power-up, the 4700 system looks for an
MPCE
closed condition. If this is found, it will enter a state consistent with the sele
cted operating
mode. When the 4700 system enables its safety outputs, it monitors the MPCE for a closed-to-open
transition. This transition must occur within 300 ms or the 4700 system considers the MPCE faulted.
The 4700 system will then enter an alarm state. Additionally, if the MPCE connections are incorrectly
wired, the 4700 will enter an alarm state.
Upon entering a machine stop state, the MPCE input must close within 300 ms of the safety output
switchin
g or the system will
enter the alarm state. The ability to disable MPCE monitoring is provided
using the configuration switches located in the controller.
NOTE! When MPCE is not active, place a jumper between the terminals MPCE and MPCE RTN for
the DIN controller (or place a jumper between terminals 1 and 2 of TB7 for the Solid State Output
Version of the metal chassis controller).
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