DH+/RIO OPTICAL COMMUNICATION MODULES USERS MANUAL
Copyright © 2003 by Phoenix Digital Corporation, All Rights Reserved.
Specifications detailing J4 connector pin-out are provided in Table 10. Further explanation of OCM
diagnostic functions is provided in Sections 1.3.3.5-1.3.3.10. Electrical specifications for diagnostic
relay outputs are given below:
Diagnostic Relay Contacts
Arrangement : 1a
Initial contact resistance, max. : 30 Meg Ohm
Rating (resistive)
Max. switching voltage : 380 VAC, 125 VDC
Max. switching current : .5A
Initial breakdown voltage
Between open contacts : 1,000 Vrms
Between contact sets : 2,000 Vrms
Between contacts and coil : 3,000 Vrms
Initial insulation resistance : 1,000m ohm at 500 VDC
FCC surge voltage between open contacts : 1,500V
(Note: Standalone, Panelmount OCMs are shipped from the factory with Diagnostic
Relays disabled. To enable Diagnostic Relay Outputs, Diagnostic Select Switch
SW4-1 must be set ON by the user.)
1.3.3.2 1771 PLUG-IN OCMs (Modules with “-D” Diagnostic Option Only)
Activation, control, and monitoring of 1771 Plug-In OCM diagnostics is provided under program
control thru read/write status and control bytes in the PLC I/O Image Table, and is also provided
under manual control via Diagnostic Select Switch Settings. The 1771 Plug-In OCM
(with “-D” Option) occupies a single I/O module slot, and simulates either an 8 bit bi-direc-
tional I/O module (when OCM Processor Write is Enabled) or an 8 bit input module (when
OCM Processor Write is Disabled). The OCM is addressable to the 1771 I/O module slot it
occupies. The 1771 I/O module slot addressing density (2-slot, 1-slot, 1/2-slot I/O Group) is
switch selectable on the backplane of the 1771 chassis. (OCM modules without the “-D”
diagnostic option do not have a 1771 bus interface and appear as empty slots to the processor.)
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