State Industries GFK-0827 manual Bus Transmitter Module, LED Status Indicators

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Bus Transmitter Module

A Bus Transmitter Module (BTM), catalog number IC697BEM713, is required in both the Primary PLC CPU rack (rack 0) and the Secondary PLC CPU rack (rack 0) in a Hot Standby CPU Redundancy system. The BTM provides a path for Redundancy communications when connected to the Redundancy Communications Module (RCM). Each PLC system (Primary and Secondary) has a BTM and an RCM in rack 0. The BTM in one unit connects to the RCM in the other unit (or through a series or BRMs if expansion racks are in a system).

		PRIMARY UNIT		SECONDARY UNIT			a47006
		( RACK 0 )		( RACK 0 )
P	C B	R G	P	C B	R	G
S	P T	C B	S	P T	C	B
	U M M C			U M M C
		31				30
		Redundancy Communications Link
		Redundancy Communications Link
When included as a bus communications module in an I/O							a42986
expansion system, the BTM is a high speed parallel interface which
propagates the I/O bus signals through a cable to a Bus Receiver
Module located in the first I/O expansion rack. The BTM also
provides a high speed parallel connection to the programmer
through the Work Station Interface board installed in the
programmer.
							MODEL 70
							BEM 713
LED Status Indicators							MODULE OK
							PROGRAMMER
							EXPANSION
							PORT ENABLED
							PORT ENABLED
There are three LEDs located at the top of the BTM. The LEDs are							ON = OK, ENABLED
							MODULE FUNCTION
labeled: OK, PGMR ACTIVE and BUS ACTIVE. As with all other
							SERIES 90±70
Series 90-70 PLC LEDs, they are visible through the clear plastic lens							BUS TRANSMITTER
							PARALLEL
							HIGH SPEED
at the top of the module's cover. The function of each LED is							INTERFACE TO
							90±70 EXPANSION
							PROGRAMMER AND
described below.							RACKS.
Module OK							PARALLEL
							PROGRAMMER
							PORT
							ONLY
The top LED is the MODULE OK LED and is ON when the CPU
software completes its power-up configuration of the BTM, and has							50 FT. MAXIMUM
polled (or attempted to poll) each expansion rack in the system. It is							CABLE LENGTH
OFF when any of these conditions are not met.
							EXPANSION
Programmer Port Enabled							PORT
							TO BEM 711
							(7 DROPS
The middle LED is the Programming Port Active LED. This LED is							MAXIMUM)
either blinking or ON when the programmer and the PLC are							CABLE LENGTH TO
communicating. It is OFF when they are not communicating.							50 FT. MAXIMUM TOTAL
							LAST BEM 711
							MODULE
Expansion Port Enabled							IC697BEM713
							44A726758±103
							LABEL

The bottom LED provides the status of the expansion bus.

This LED is either blinking or ON when the BTM is communicating with the Bus Receiver Modules connected to it through the parallel

	I/O bus link. It is OFF when they are not communicating.	BUS TRANSMITTERMODULE
22	Series 90-70 Hot Standby CPU Redundancy User's Guide ± December 1993		GFK-0827