GE EPM 9650/9800 manual ElectroLogic Block, Format of a Relay Structure

7.29: ElectroLogic Block (46421-46804)

An EPM device will support 16 Relay structures.

Εach Relay Structure will combine up to 8 Limit Comparisons or Combinations using a three-level binary tree of AND, OR, NAND, NOR, XOR or Hysteresis combinations. All trees will be reevaluated once per second. The final result of the tree, subject to delays, would then be queued for immediate transmission to External Relay Output devices.

Information needed to perform these actions:

•Input Limit Comparison and Combination Identification

•Input Senses for Each Input

•Combination Assignments for Each of 7 Gates in the Tree for Each Relay Structure

•Delay Times

Input Sense would apply to each input, negating an input state; in effect this would be the above/below equivalent for non-limit inputs like low speed inputs.

Comparison and combination identification would be performed by referencing the internal data table of the EPM, by specifying the Line number and Point number for a particular bit. For example, to refer to the first comparison of Limit 1, use Line 231, Point 0; first comparison of Limit 2, use Line 231, Point 1; first comparison of Limit 20, use Line 231, Point 19; second comparison of Limit 1, use Line 232, Point 0. To leave a line unassigned with a value of 0, use Line 65535, Point 255.

Binary Tree combinations: AND, OR, NAND, NOR, XOR and Hysteresis.

Delays are in seconds, and with a separate delay for activation (0-to-1 transitions) and deactivation (1-to-0 transitions).

The format of a Relay Structure:

2 byte	Line Number, First Tree Input
1 byte	Point Number, First Tree Input
1 byte	Unused

This 4 byte structure is repeated 7 more times for a total of eight inputs, 32 bytes.

1 byte	Input sense & combination A, combining inputs 1 & 2
1 byte	Input sense & combination B, combining inputs 3 & 4
1 byte	Input sense & combination C, combining inputs 5 & 6
1 byte	Input sense & combination D, combining inputs 7 & 8
1 byte	Input sense & combination E, combining A & B
1 byte	Input sense & combination F, combining C & D
1 byte	Input sense & combination G, combining E & F
1 byte	Unused
1 byte	Delay in seconds from 0-to-1 transition before reporting 1
1 byte	Delay in seconds from 1-to-0 transition before reporting 0
6 bytes	Unused

Total of 48 bytes per Relay Structure, total of 768 bytes for 16 Relay Objects.

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