Hach sc1000 user manual Bus status, 118, TEST/MAINT Display Info, TEST/MAINT BUS Status

Advanced Operations

TEST/MAINT

DISPLAY INFO

SOFTWARE VERSION	Displays the software version of the display module
SERIAL NUMBER	Displays the serial number of the display module

6.4.1 Bus status

The Bus Status menu informs the user about communication problems which might restrict data availability and degrade the overall sc1000 controller operation.

More detailed information can be obtained from the Diagnostic file (refer to section 6.3.9 on page 116).

TEST/MAINT

BUS STATUS

RESET COUNTER	Resets data acquisition and updates the START time.
	Enters a sub menu where resetting can be confirmed/cancelled.
START	Displays a time stamp (date, time)
	The time stamp indicates when data acquisition of the sc1000 controller was started/reset.
COMMUNICATION	Communication Statistics
	Displays the event count when a device (probe or input/output module) does not respond to a
	controller request within a guaranteed time.
TIMEOUTS_3	The sc1000 controller tries to connect to the device three times. After the third unsuccessful try
	the counter increases by 1. Generally, the counter increases, if bus devices/bus segments are
	not properly connected or the bus devices encounter serious errors.
	Displays the event count when the sc1000 controller detects a malformed response to a request.
TELEGRAM_3	The sc1000 controller tries to detect a valid response three times. After the third unsuccessful try
	the counter increases by 1. Generally, the counter increases, if electromagnetic shielding is not
	appropriate for rough environment.
	The Token Circulation duration displays the time where all master devices get the master role
	(“token”) once.
	In an sc1000 controller there can be multiple master devices, for example devices that put
	requests to other bus devices (for example display unit, current output, relay, and network
TOKEN CIRCULATION	adapter card). As only one master can be active, the master role is shared among these in a
	certain “round robin” way.
	The Token Circulation time influences the time, within output modules can detect value changes
	from other devices, and therefore shows a sc1000 controller response time. This time depends
	on the number of connected devices.
MAXIMUM	Maximum TOKEN CIRCULATION duration in ms since START.
(at time)	Time stamp when the MAXIMUM TOKEN CIRCULATION duration was measured.
AVERAGE	Average TOKEN CIRCULATION duration in ms (taken for the last 128 round-trips).
	Median TOKEN CIRCULATION duration in ms (taken for the last 128 round-trips). This value is
MEDIAN	not influenced by isolated/non repetitive events (for example log file transfers/software updates)
	and is therefore more reliable than the AVERAGE value.

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