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.