Mapping Device Control Block Bits to I/O Scanner Entry Numbers

Issue
To inform users the incorrect IO scanner device control block bit map in Modicon Quantum with Unity Ethernet Network Modules User Manual.

Product Line
Modicon Quantum

Environment
140NOE77101

Resolution​​​​​
Effected Documentation: Modicon Quantum with Unity Ethernet Network Modules User Manual

Related Product part number: 140NOE77101/11

· To use %MDx.4 as device control block, the double word to enable/disable each I/O scanner entry is described below:

Register
Double Word %MDx[0]	Table Entry #	1	2	3	4	5	6	7	8
	Bit	31	30	29	28	27	26	25	24
	Table Entry #	9	10	11	12	13	14	15	16
	Bit	23	22	21	20	19	18	17	16
Double Word %MDx[1]	Table Entry #	17	18	19	20	21	22	23	24
	Bit	15 **	14 **	13 **	12 **	11 **	10 **	9 **	8 **
	Table Entry #	25	26	27	28	29	30	31	32
	Bit	7 **	6 **	5 **	4 **	3 **	2 **	1 **	0 **
	Table Entry #	33	34	35	36	37	38	39	40
	Bit	31	30	29	28	27	26	25	24
	Table Entry #	41	41	43	44	45	46	47	48
	Bit	23	22	21	20	19	18	17	16
	Table Entry 49 through 112
Double Word %MDx[4]	Table Entry #	113	114	115	116	117	118	119	120
	Bit	15	14	13	12	11	10	9	8
	Table Entry #	121	122	123	124	125	126	127	128
	Bit	7	6	5	4	3	2	1	0

• • NOTE**: it is the bit of MDx[1] used for I/O scanner table entry 17 to 32, not MDx[0].
    Bit number: Bit 0 is a low bit counting from right side.
    
    Example:
    If users configure %MD1:4 as device control block, %MD1[0] bit 31 can enable/disenable I/O scanner table entry 1. %MD1[1] bit 15 can enable/disenable I/O scanner table entry 17.
    

· To use %MDx.4 as device control block, users also can use single registers to enable/disable each I/O scanner entry as mapped below:

Register
%MWx+1	Table Entry #	1	2	3	4	5	6	7	8
	Bit	15	14	13	12	11	10	9	8
	Table Entry #	9	10	11	12	13	14	15	16
	Bit	7	6	5	4	3	2	1	0
%MWx+2	Table Entry #	17	18	19	20	21	22	23	24
	Bit	15	14	13	12	11	10	9	8
	Table Entry #	25	26	27	28	29	30	31	32
	Bit	7	6	5	4	3	2	1	0
%MWx+3	Table Entry #	33	34	35	36	37	38	39	40
	Bit	15	14	13	12	11	10	9	8
	Table Entry #	41	41	43	44	45	46	47	48
	Bit	7	6	5	4	3	2	1	0
Table Entry 49 through 112
%MWx+8	Table Entry #	113	114	115	116	117	118	119	120
	Bit	15	14	13	12	11	10	9	8
	Table Entry #	121	122	123	124	125	126	127	128
	Bit	7	6	5	4	3	2	1	0

• • 
    Bit number: Bit 0 is a low bit counting from right side.
    Example:
    If users configure %MD1:4 as device control block, %MW2 bit 15 can enable/disenable I/O scanner table entry 1. %MW3 bit 15 can enable/disenable I/O scanner table entry 17.

Schneider will correct the documentation -- Modicon Quantum with Unity Ethernet Network Modules User Manual to match the current implementation.